Red rock made him bleed through his mouth. Forget about how he makes him bleed with advCoc. Don't compare Oden's sword and Luffy's attack. He made him bleed with bare hands. Lets see Zoro not get one shot without his swords. You have gone whole new level of retardness here.
All the Scabbards made Kaido bleed. Zoro's dragon twister made Kaido bleed from his body and mouth with his own powers. Oden's sword is nothing without a powerful swordsman controlling it.
Kaido and Big Mom combined couldn't one shot Zoro with hakai. Zoro used barrier haki to temporary blocked the attack before he took it.
Why are you trying to take away Zoro's swords. You don't see me trying to take away Luffy's DF and change his style. They both attacked with their power and style. Both used lethal attacks but only one scarred Kaido.