"Hmm, I see, I'm going to send you to Garp so you can train with Ace and become stronger together. It should make you guys bond and want to protect each other because I can't always be there to save you when you're in trouble."
"Gaaarp!!, why did you give me another runt!, I struggle to deal with 3. Let me guess this kid is important in the world or has ties to family members who are known. You are right Dadan, Rayleigh is his Uncle. Nani!!! How did my life do from being a mountain bandit to taking care of kids from strongest men of this world. Dadan if you let him die, The Dark King would take your life himself."
"Nani? Yess---sir, stated Dadan!"
"I see, I need to get a bond with Ace and Luffy, and get them stronger, especially Ace!
(Maybe I can save Ace from his destiny. However, my plans do say otherwise, stated Jacob as he utilized Advanced Kenbunshoku Haki)
"Sabo, Ace and Luffy, wanna see something cool. You guys should attack me at once. Sabo: "That's overkill for you even if you are stronger than us said Ace." Ace: Fine, you asked for it. Ahhh, Sabo and Ace went for the stomach, and Luffy went for head. I effortlessly dodged using Ken Haki(Observation).
"What?" said Ace, How did you do that said Sabo, Cool, teach me Jacob said Luffy? It's called Haki, that's how Jiji can injure Luffy even though he is rubber. I used Ken Haki, it allows you to dodge things way easier, it gives me abnormal sensing so you can dodge things and move faster, there is Buso Haki which gives you more offense power and using Buso for defense, it nullifies the devil fruit powers effects on a person's body. Although Ken easiest to learn, there is Conqueror's Haki, it is rare, and allows you to make those who have less willpower than you to pass out or even die if it's advanced enough. You can use it to enhance Buso Haki and have more range. What!! Haki is so powerful, no wonder you're so strong! said Ace, I agree said Sabo. Whoa!, teach me that Jacob", stated Ace. (I'll be able to surpass my father this way)
"I'm gonna teach you all basic Ken and Buso, but your body needs to be prepared, so we would train on our body beforehand."
"Ace's training": I made him train on his Buso and Observation, I used guns and objectives even faster so he can dodge a lot of attack even if they are imbued in Haki. I made him train in Buso by fighting me for 3 hrs and trying to destroy 10 boulder 50x the size Tanjiro had to cut down once every 2 days.
"Sabo training: Ken training was same as Ace, but for Buso, I made him imbue it in his pole so he had more range versatility and power!"
"Luffy training: Helped him grow his durability so he can with and the impact of rubber. while helping him being as good as he was 17, and trained him on Buso because the power of his rubber is a lot of power, and so he won't be useless against Logia users like Crocodile. With Ken Haki, i trained him like Rayleigh trained me and Luffy in the normal timeline blindfolded fighting against animals(although significantly weaker) "
Jacob was the same age as Luffy, he'd decided to sail when he reached 15. Sabo had joined Dragon, while Ace joined Whitebeard when I talked about how he rivaled his father in strength.
Luffy perspective: "Bye Jacob, bye town. A sea beast emerged, back off as I used Conquerors to make it run. Then I killed Alvida and Morgan and recruited Zoro from an island when I saw him bounty hunting a random pirate. I told Zoro he is nowhere near mihawks level, he didn't believe me. So I effortlessly broke his sword and brought him to the point of death, he realized how weak he was, and I planned to teach him the first stage of Busoshoku Haki.