Big Moms comeback
Okay so hear me out - Big Mom and Kaido were both defeated and sent plummeting into the upper mantle. Big Mom seemed pretty confident this wouldn’t kill her, and I wouldn’t be surprised if it didn’t. Now that’s not to say she wouldn’t be heavily wounded. I mean she is fairly old and just went through a hell of a fight, and so did Kaido. Big Mom has a personal vendetta against Kaido for stealing the azure dragon devil fruit from her, and considering his weakened state it wouldn’t be impossible for Big Mom to take his soul from him to heal herself and survive the damage from the fall. On top of that, if we believe that Blackbeard is able to have two devil fruits because he has multiple souls, then it would make sense that Big Mom could also have two devil fruits if she were to absorb the full soul of someone as powerful as Kaido. I mean she already got her own fruit from eating Carmel, so what if in the endgame Big Mom makes her comeback after absorbing Kaido and his Devil Fruit, climbs her way out of the mantle, and then pops up pissed as hell with the azure dragon and soul soul fruits?