Oda said One Piece was going to end in 5Y originally, which probably means Marine Ford was supposed to be the final arc. Looking at what happens in that arc the Marines and WG start off as the main enemies and then Blackbeard comes in at the end as a bigger threat. Chances are the same will happen again with Teach appearing towards the end of the fight with WG and become a bigger threat.
Because of this Teach stealing IM’s powers has been my goto assumption for the absolute final battle of the series.
Because of this Teach stealing IM’s powers has been my goto assumption for the absolute final battle of the series.