Luffy's Red Roc makes Kaido bleeds.
And Zoro's Rengoku Onigiri certainly are not Zoro's weakest 3 sword style attack.
Zoro and Killer only attacks Kaido's feather cloak. Not his body.
Literally same "debris" thing with Sanji vs Doflamingo.
Same thing with Luffy vs Kaido round 1.
Then Luffy's Kong Gun clearly makes Kaido bleeds if you zoomed in.
And then freaking Kaido screams from falling rocks caused by Law lol.