People know that, but some still cope and claim that Saturn is somehow not gonna be strong enough to require Luffy. Him explicitly having devil fruit powers (or whatever the fuck he pulled in the throne room scene) should have been confirmation enough that he is going to be Luffy's matchup in my opinion.
Listen, the ONLY scenario I can see where Zoro does not fight Kizaru is if Dragon pulls up to Egghead and handles Saturn while Luffy fights Kizaru. Any other scenario involves Zoro going up against Kizaru. He has ALWAYS done this when Luffy handles his fight and needs somebody that takes care of the second biggest threat.
As for who Sanji fights? How about Lucci? Yeah, remember that guy? And before you say Jimbei he is gonna be busy saving the rest of the crew from the Seraphim. The fuck is wrong with people who think Lucci and, for that matter, Kaku will not be on the side of their literal boss here? You DO remember they didn't join the crew, right? I know it has been sometime since the last Egghead chapter, but the way some people are talking makes me wonder if they forgot that CP0 is not going to be on the Strawhats side once Saturn arrives.