Quote Originally Posted by DarthEnder View Post
Besides, Ace needs to take his place as one of the Four Emperors.
We don't even know if Ace survives this ordeal. Shounen textbook says he will, but One Piece isn't, fortunately, above seeking its own paths instead, ignoring such traditions. It would depend on what kind of an impact this whole arc is supposed to have on Luffy and the world.