King and Queen could dealt with the Scabbards with considerable ease during Oden vs Kaido flashback, the anime fleshed it out even more.
I don't expect a casual slash/piercing attack with Ryou to be strong as Zoro's Asura strongest move with Enma.
Yes, he had help, and Kaido wasn't even caring about Zoro until he got hit by his last attack, that whole situation is a 3vs1 one fight, Law saved Zoro twice, as i said, Kaido ate everything they threw at him, the only one who was getting acknowledged by Kaido since the start was Luffy