Teach vs Naruto
So, since we were two days late (I swear it was one day when I commented, but IDK), I'll say it here.
I think the reasons for Teach aren't good enough.
His absorption is, first of all, slow. It took several seconds by the perspective of marine fodder to absorb things, and it wasn't that fast against Ace either. He would not be able to absorb a bijuudama before it detonate.
Teach takes hits head on a lot of time for no real reason. Even Luffy got a punch in against him. And even if you call that outlier, he still doesn't dodge much. Naruto's preferred ranged attack destroys on a cellural level. I don't think I need to say more than that.
Naruto can get out of the absorption by substituting. Especially since the sinking is slow, and as far as I remember Teach's only direct gravity manip just brings people to him, not to his absorbing shadow thing.
Naruto has clones, and that's an obvious advantage.
Naruto can predict what he wants to do to a certain extent with empathy and all that (I am awere that isn't rare in one piece, but I don't think Teach had it at this point and several kilometer detonation don't really care about the enemy knowing).
Naruto can summon Ma and Pa to mindhax him with sounds, tough that's pretty OOC in this key as a starting move.
Those are the reasons that come up at the moment.