999 - Dragons (Prediction)
Ace comes to Onigashima to kill Kaido and save Wano but he meets Yamato instead.
Yamato tells Ace, if he can't beat her he stands no chance against Kaido. Ace tries to use his flames but Yamato is impervious to flames. Yamato reveals she's half dragon and Kaido is the real deal. She advices him to learn Ryou from the Samurai.
Ace learns CoA and comes back but still can't get past Yamato. Yamato explains she still has scales even in human form.
Ace comes back for a third time, this time he has advanced his haki and manages to injure Yamato, even his flames start to hurt her. She acknowledges that he's become stronger but it's not enough. Their bout gets interrupted by King who wants to take Ace to Kaido they both fight him, Yamato tells Ace to leave but come back for her when he gets stronger. King takes Yamato to Kaido, they cuff her with the explosive cuffs so she doesn't leave Onigashima, she meets Ace one last time but she tells him she can't leave with him. Ace promises to come back one day for Kaido's head. He wants to defeat Whitebeard first before he takes on Kaido.
Present
Kaido and Big Mom are arguing. BM wants to kill Luffy and turn his life force into a powerful homie. Kaido says it's a waste. He let Ace slip when he came to Onigashima 4 years ago before be became a big deal, he still intends to make Luffy his subordinate. Kidd arrives and pierces Kaido's chest while killer fends off Big Mom and declares he's come to pay him back.
Big Mom has been meaning to take revenge on Kidd for sinking 2 of her ships and stealing something from her.