Sure, Kaido, the motherfucker that has been screaming about wishing to die since his first appearance, will be okay at the idea of Luffy not killing him. Yup!
Get a grip. If Luffy ain't killing Kaido, somebody else will. Does not even have to be Zoro before people jump down my throat. Momo, any of the scabbards, Zoro, fucking Killer for all I care, but SOMEBODY will slice and dice Kaido by the end of this story. The only character I cant see killing him is Blackbeard since him getting the same fruit Kaido has would be too redundant in a visual sense for Oda to pull.
Oda cant pull his usual Luffy crushed the villains spirit bullshit with Kaido this time. Kaido has his ass whopped seven times already. If he isn't killed, it has been explicitly hammered how he will continue to be a threat. And Luffy sure wont be sticking around Wano like Ryuma did to defend them. So he either kills him or somebody else does.