After Kaido whats the point of defeating a admiral? Luffy might clash with him briefly and clown him, but his fight is still gonna be against Saturn. Like, Oda only inserted Saturn in there because he himself knew Kizaru ain't strong enough to give Luffy a good fight now. His a mythical Zoan, probably godly Haki and known as a warrior god against sun god. The match up is obvious. It'll probably be Luffy V Saturn and the Sanji/Zoro and other Straw Hats jumping Kizaru (the light punching gloves are obviously a plot device for the ones unable to use haki to hit Kizaru). Then once Kizaru's softened up it'll probably end in Zoro + Sanji V Kizaru 2v1, Jinbei V Seraphim Jinbei etc etc.