Kahn did nothing to stop Hancock from leaving.
On the contrary, he was actually very much in favour of Hancock going back and then helping him take over Amazon Lily Island.
Dressrosa and the Amazon Lily Kingdom are two of the three countries that Kahn is eyeing.
In order to gain control of Dressrosa, future Queen Scarlet, Viola, and the Kingdom of Tontatta next door, Kahn will patiently take care of Scarlet's children and repeat the adventures they experienced.
Even if Gloriosa didn't ask Rayleigh and Shakky to bring her to Hancock, one day, Kahn would let Hancock return to Kuja Island and help him conquer Amazon Lily.
In addition to Wano, Amazon Lily has a complete Haki system and can mass-produce Haki powerhouses. Moreover, the women in this country are as pure as the little people and the giants and are trustworthy.
Like Kahn's trip to the Sabaody Archipelago, the three Devil Fruits he harvested, including two Zoan Snake-Snake Fruits as gifts, can be used to train outstanding Kuja warriors. He doesn't worry about them betraying him after gaining power.
It is no exaggeration to say that as long as the Amazon Lily Kingdom is mastered, Kahn, like Kaido, does not need to expand too much territory. He only needs to cultivate a few trustworthy giants and cadres and recruit a few affiliated pirate groups to become one of the overlords of the New World.
Hancock's Sisters are the top cadres of the Cross Family, and the fighters of the Kuja Pirates are Cross Family's military team. With both, Kahn is well-prepared.
When he gets the third country, the general trend will be accomplished, and the New World will enter the era of Cross Kahn.
After bidding farewell to the three Boa sisters, Kahn used telekinetic power to lift their ship, flew over the Reverse Mountain, and returned to West Blue, one of the Four Seas.
After a few months of returning to this sea area again, Kahn's identity and status seemed to have undergone earth-shaking changes.
Although the Grand Line is one of the smallest sea areas in the world, it is just a route sandwiched between the Four Seas and the Calm Belt. But it is recognized as the road of the strong by the whole world. Only the pirates who prove themselves on this road can be called real big pirates. Otherwise, those who dominate the Four Seas are just fake big pirates.
Just as the New World is clearly part of the Grand Line, it is only the second half of the Grand Line. The pirates of the New World called the first half of the Grand Line a paradise, thinking that the pirates who made a big splash there were just playing games. The pirates in the first half of the Grand Line also look down on the pirates of the Four Seas, and the Four Seas look down on the weakest East Blue. This chain of contempt in the sea is very obvious in this world.
When entering the Grand Line, Kahn, with his titles of "strongest supernova in history" and "having two monster templates," still made the pirates of the Grand Line unconvinced of him. Countless people wanted to step on his head to become famous worldwide.
But in just five months, Kahn jumped from the strongest supernova in history to one of New World's great pirates, one of the "strongest twin stars" with a bounty of 1.555 billion berries.
The other "strongest twin star" and "world's most beautiful woman" is also his maid.
At this time, Kahn, like Shanks in the original story, is already the most famous big man in West Blue.
Back in West Blue, Kahn immediately called Capone Bege.
Two days later, when Kahn arrived at the current headquarters of the Capone family and met with Capone Bege, Bege had already prepared what Kahn wanted.
It was a square box, fifty centimetres wide and one meter high. Only Kahn and Capone Bege knew what was inside.
"Bege, from now on, you don't need to hide our relationship anymore," Kahn said, using telekinesis to place the box into the cabin. "In the future, when expanding the territory or encountering difficulties and dangers, you can take out the flag of the Cross Family and call me."
"Also, when I return to the New World, the Cross Family will officially join the Dark World and start expanding their business."
"At that time, I will cooperate with Umit, one of the Emperor of the Dark World, known as the Sea Transport King. His transport ship will carry part of the minerals from Morelai Island to West Blue for you so you can quickly unify West Blue's gangs."
"I understand, BOSS," Capone Bege replied respectfully.
"Do well, and I will help you find a powerful Devil Fruit in the New World," Kahn said, patting Capone Bege on the shoulder.
Next, Kahn's group spent a day at Capone Bege's base camp and enjoyed Bege's warm hospitality.
The following day, Kahn sailed his ship, taking Scarlet and his daughters to some of the more prosperous islands in West Blue. They played for a week and finally visited the island where Kahn grew up for a day before leaving West Blue.
Kahn's trip back to West Blue was primarily to pick up items from Capone Bege. If it weren't for Scarlet and her daughters being curious about Kahn's hometown, he wouldn't have stayed to play in West Blue for a few days.
After a brief visit, Kahn used telekinetic power to support their ship, flew over Reverse Mountain again, and entered North Blue, which is considered the strongest sea in terms of overall strength.
North Blue is called the strongest sea area not because of Vice Admirals Sakazuki and Borsalino, the future Marine Admiral and Fleet Admiral, but due to the constant wars and harsh living conditions that produce powerful individuals.
Additionally, North Blue is known for the killer family that once used force to rule the region, Germa 66, and the rapidly developing Donquixote Family, one of the giants in North Blue's Dark World.
Kahn's brief return to West Blue and the decision not to stay long was to come to North Blue to find someone. That person is Donquixote Doflamingo, the patriarch of the Donquixote Family.
Incidentally, Kahn received a black market phone call in the Sabaody Archipelago, and the document faxed to him contained information about the Donquixote Family.
----------
You can read advanced chapters here: patreon.com/GregariousLion