"Marco remembers when Ace returned to the Whitebeard Ship He wanted to go to Wano many times to fulfill his promise with Otama, but Whitebeard did not allow him to do so because he knew that Ace's current strength would not enable him to defeat Kaido and this is the reason why Ace did not come to Wano again."
Oh fuck ...
That's complete bs writing once again. So Ace even tried to convince WB, that things look pretty bad in Wano and that they have to save them from Kaido, yet WB said "Nah..." and let his sworn brother Oden just die like that?
What the actual fuck is that, Oda?
He introduced WB as a character, who raises hell, when only a single (unimportant) member of his crew is getting hurt, yet he suddenly doesn't care about Oden anymore?