When did I say their situation is same?
Luffy couldn't beat Kaido fair and square. Got a ceiling he's already adept at.
Zoro only went all out against Kaido while being very Injured. He still has a vague CoC ceiling and Enma turning black blade hype, amongst other things.
Long story short, they both have a lot to offer against Kaido.
It's King who doesn't have any growth to offer to someone who scarred and blitzed Kaido while being very Injured. If Zoro's getting back up, he's not going to degrade into fighting someone far beneath what he has already shown.
It's always an upward path, and insulting me won't make your shit take any better.