Honestly confused by this whole King>Kaido shilling.
King actively defends against Zoro's slashes. Kaido takes every single hit thrown at him outside of dodging. He has not truly blocked once. King has the advantage of having wings that are seemingly like steel, something Kaido does not have.
This is like comparing Zoro and Luffy's AP, like Zoro has SWORDS lol, of course he'll always have an advantage there if Luffy doesn't use his AdCoA or AdCoC. That was the whole point of Wano's Ryou discussion, giving Luffy a "flow" power similar to how Samurai use Haki with their blades.