'Kid, i think it's time for you to learn Nature Chakra (Senjutsu).'-Kurama
'What?'-Jon
'You need to train in Senjutsu, that will make you understand the wood & plants better. Plants are part of nature, so you will grasp the concept easier if you can feel the nature itself.'-Kurama
Kurama then explain to Jon that if he can use Senjutsu, then not only wood release, all kind of chakra transformation will be easier to train. Everything is part of nature, but wood is the deepest, but also basic.
Kurama also explain that chakra originated from God Tree, which is plant. God tree was made from absorbing the planets chakra, which is Senjutsu. So Senjutsu is the most basic form of chakra, and hard to utilize.
"Wait, i thought that Hashirama can use Senjutsu because he feel it after having wood release."-Jon
"He is. He can feel Senjutsu because he can control plants, the closest life form with nature. When he can control Senjutsu, he can increase his understanding of Wood Release."-Kurama
"Oh, but why can't i feel Senjutsu after having wood release?"-Jon
"Be more realistic kid! You just got it for a little more than 2 months. Even Hashirama could feel it after years."-Kurama
"We-well, you're right. So how'd i train Senjutsu? You can teach me?"-Jon
"I can tell you the basic of how to do it. I'm not a teacher, and i can't really teach you well. So i will only tell you how i do it, then i will help you stop the side effect if you lost control of the Nature Chakra that you gather."-Kurama
Jon agree to Kurama, he know Kurama is basically a Nature Chakra himself, or at least half of his body is Nature Chakra. So he can gather Nature Chakra even in his sleep, albeit slowly. A feat that no human can achieve till now. That's why Kurama in Naruto's body can recover himself even after his Yin self was sealed in Minato with Shiki Fuujin.
(a.n: Sorry if i'm wrong, i'll just use this for convenience)
Jon then do as Kurama's say and remember Naruto's training in Mt. Mobyoku. Jon meditate and try to empty his thoughts. It is easier to say than done, he often meditate, but to empty his thoughts almost completely is hard, very hard.
Jon keep trying to meditate and feel the Nature energy until the ship reach Baltigo. Jon continue his Senjutsu training, and he finally feel the Nature Chakra after 3 weeks of training. He didn't have any helping tools like toad oil, and he can only rely on his wood release to feel the chakra.
Jon only use his wood release to feel the nature chakra, so his wood control also increase. Now he need to absorb the Nature Chakra while meditating. Kurama explain the process, and then Jon try it.
It take him 1 more month to succeed in gathering Nature Chakra. It take long because not only he didn't have oil like those toads, and he have some tasks too. Jon is tasked to infiltrate the Underworld base in some islands. So he train while working, which make his training time lessened.
Jon start to gather the Nature Chakra while his clones spread and gather informations. Interestingly, when he lost control of the Senjutsu that he gather, he start to turn into plant, not toad. Just like now, some bud and wood branches with leaves start to grow on his right arm.
Kurama absorb the excess of Senjutsu that Jon absorb. Kurama didn't wake him up, so he can keep trying to put the Senjutsu under control. Only when it went too far would Kurama wake Jon up and make the Nature Chakra leave his body.
"Phew, not as easy as i thought. It seem Naruto & Hashirama really have high talent on Senjutsu."-Jon
"It's not that you're not talented, but the Nature Chakra in this world is different from Shinobi World. So it's not strange for you who have power originated from that world to have difficulty here."-Kurama
"Is that how it is?"-Jon
"Let's just say it is how it is. Beside, people grow faster in pressured condition. Hashirama can grow fast because he is in a war era. So he need to grow fast or he will die in war."-Kurama
"Naruto also train very fast because he know Pain will attack Konoha. So he need to grow strong fast if he want to protect his village."-Jon
"That's right, but you didn't feel pressured or anything in this training. You have 2 years time, and it's only a little more than 1 year. There's no pressure for you with that time span."-Kurama
"I think you're right, then i will enjoy this last year of training, and not make myself stress that make me can't train properly."-Jon
Jon train & do his spying task for the next 6 months. While doing his spying task, he also take some time to hunt some pirates. He use them as sparring opponents, and money source. At first, he always left his clones to do his work, but he remember that he have 10 Zetsu, so he use them to do his spying job.
'These White Zetsus are very useful, they're just need to shut their mouth most of the time.'-Jon
Jon has fuse his chakra at them, so they also have the wood chakra. With wood chakra, they can easily travel anywhere undetected. They're just like plants, so it's hard to detect them. But they still have presence and intent, so strong haki user can actually detect them.
Chakra sense detect chakra signature, and Zetsu's chakra can blend with his surrounding. Sensor ninjas can't detect Zetsu because they sense chakra, which Zetsu can hide with their natural trait. On the other hand, Observation haki detect intent and presence rather than energy. It is similar to Naruto's Kyuubi mode's sensory ability that detect emotion.
That's why Kurama said that Jon need to merge chakra sense & observation haki. Jon has try it some time, but now he is more focused on wood release & Senjutsu. Still, after he can feel Zetsu's presence with haki, Jon also found a problem. If haki can detect even Zetsu, then his stealth skills will also got detected.
So now Jon start to increase his training in stealth again. That training required him to train chakra sense & observation haki. So he also got serious in trying to merge them. That is his training in these 6 months.
After those 6 months, he have made progress in Senjutsu and can control it. He is still an imperfect Sage like Jiraiya, but his marking is like Hashirama. Altough his marking is very thin and only looks like the outline of Hashirama's. Now he just need to raise his control over Senjutsu to enter Sage Mode.
Jon also make progress in his wood release and he believe he can be at Yamato's level. Senjutsu training really help him feel his power more thoroughly. But that's also make him have difficulties at concentrating on his Senjutsu training. Training a lot of things at the same time is very hard.
It's very hard but he still train his haki, wether armament or observation. He also start to merge observation haki & chakra sense. It's a lot easier than he thought, but it's not strong enough because he has just try it. Now he just need to find out how to hide his presence from Haki detection.
Jon also has make progress in other things like his fuinjutsu, medical jutsu, mangekyou, sword art, etc. He train a lot of things at once that make him can't concentrate on one. He want to focus, but he know he need it all, so he still learn all of it.
Jon use his clones to train & learn while the Zetsus are gathering information. This make his training more effective, but it still too much work. But Jon enjoy it, because it's every man's dream to be able to use super powers like him, so he won't waste it. He even make concept of many moves from anime or manga, and will try to recreate them sometime.
When his 6 months training end, Jon need to go back to Baltigo, but he want to visit Alabasta for a while. He miss Vivi and want to check on his hidden village. Dragon grant it and Jon go to Alabasta, but he won't stay for long, because he still want to continue his training.
Jon arrive in Alabasta and immediately go to Alubarna and meet Vivi. Jon just stay for a week and they have some dates, and training. Jon is surprised seeing Vivi can learn some altered Rokushiki like Soru, or Shigan & Rankyaku with her staff.
"You seem very motivated in your training."-Jon
"Of course, i won't let you guys leave me behind."-Vivi
"You're very competitive. Vivi, i have something for you, well, i don't know if it's something or someone."-Jon
Jon then call 2 White Zetsu, and they appear from the floor. Vivi is surprised seeing both of these Zetsu appear, and they're naked. Vivi cover her eyes, but Jon just say it's okay, these Zetsu didn't have any gender, so they don't have genitals. Vivi open her eyes slowly and it's true, surprising her.
"They're not humans, basically they're plants with human brain. You can say they're similar to Chopper, but they're plants instead of animal. They have low intelligent, but they're strong, i've trained them. So now these 2 will be your guards."-Jon
"Guards? Like normal guards?"-Vivi
"It's up to your preference, you can assign them as you like. They can change their appearance like normal person, or they can even hide in uderground. I will be more assured if they're with you, because they can help you if emergency happen and the royal guards can't do anything."-Jon
"You're too worried, but i'm happy that you think like that."-Vivi
Jon then give the 2 Zetsu command to always send any information to him and give them Akatsuki clothes. Then one of the Zetsu turn into an unknown girl, while the other one enter the ground. They have different task, one will stay with Vivi, and one will go around Alabasta or wherever Vivi goes to gather information for her safety. They can always switch task.
These White Zetsus are chatter box, but they're not evil. There's no Black Zetsu that manipulate them for years, so they're just white sheets. They follow Jon's teaching and characters after got his chakra and follow him everyday. Jon didn't know if they're really like this, or the system change their traits, but he won't complain with such good things.
After assigning Zetsu to guard Vivi, Jon check on his village progress. The village buildings has been built completely, now they just need to make the security mechanisms. Jon have many security mechanisms that he got from shop. He check all mechanisms from every hidden village, but he can only apply some that didn't use chakra control or just taking the concept.
Jon also check the ninja training, which has progressed significantly. The old students have work all around Alabasta to gain experience. There are many new bloods too, they recruit orphans in the Kingdom. There are many kids, and Jon is satisfied. It will be easier to teach kids than adults, because they are still white papers.
Jon also assign a Zetsu in the village to send him any information. Zetsu also can detect any intruder or spy that can enter the village. Still, Jon give all Zetsu freedom to have fun sometimes. They're a bunch of prankster, so they will need to have fun sometimes.
There is a Zetsu leader which he named #1 that have the big wood mouth on his body like the White Zetsu that merge with Black Zetsu. He also named the other from #2 to #10. The two with Vivi are #8 & # 9, while the one in village is #10. #1 to #7 will stay with him, and will help him to gather information, so he doesn't need to use his clones.
After finishing his business in Alabasta, Jon go back to Baltigo. 5 months again before the Straw Hats gather again like their promise at Sabaody. Jon still have many agenda and things to train, so he will use these 5 months to finish them.