User blog comment:Kaido King of the Beasts/Chapter 837: Cracking Cracker/@comment-104.200.137.108-20160827045437/@comment-24769684-20160827154813

We don't know how the battle of Jack vs. the Marines went, we don't know if the Sweet Commanders are "Admiral level", we don't know if the Sweet Commanders are equal in strength to the Disasters, we don't know how Urouge defeated the commander in the first place.

It's one thing if someone defeats a powerful opponent in an extremely contrived way that makes no sense, but in a world like OP, where there are no real "levels of power" and given the amount of unknowns that are involved in all this, it's not really worth worrying about.