I see you have a very very closed mind. Let me explain to you something mate.
Mihawk being stronger than shanks doesnt mean he is in another tier, he just is stronger. BM is an unknown, she doesnt use a ''Sword'' per se and is more of a brawler type than a sword type. And,again, just means he's ''stronger'' if he is, not by a lot.
I want you to understand something else too, you seem under the assumption that we are following a DBZ style power scaling rn where villains will get stronger and stronger, they are not. The power ceiling was shown early one with WB/Shanks(yonko) Mihawk(WSS) and Aokiji(admiral) and that lot has been clumped up together as being in the same realm several times. The Shs will keep getting stronger and the next enemies will remain stattic, allowing them to catch up until it will become 1vs1 fights, whereas now an alliance is needed since they are weaker.
Kinemon and scabbards all out attack that make them appear way more wounded than kaido by the end(who has some bleeding from the mouth and a needle prick injury) is getting ''trashed''? Why is it that you guys love hyperbole so much? Are you trying to overcompensate for something