Kaido is a turd with defense hax that allow him to tank infinite attacks of fodder like R5, but when you have the right AP (Nika/Oden) he gets instantly fodderized.
Nah, even WB, the so called WSM, did not dare to attack Kaidou after he knows that Oden was dead. Oden was clearly forced Japanese wank, it is clear that even when Akainu was scarred of samurai.
Kaidou couldn't kill scabbards. True, but at the same time, none can kill them. In fact, even the deaths that occurred are consolation deaths for no reason. Kaidou doesn't have DC feats but his AP is good enough.
DC =/= AP because the DC of thunder bagua is incomparable to the DC of boro breath.