Let's be honest, any one with common sense understands that Luffy's fight is kizaru. I can still understand you thinking that Saturn is the main villain of the arc, but what I can't understand is thinking that Kizaru is going to fight Sanji or Zoro.
Do you really think that after all the admiral build up all these years, Oda is going to allow anyone but Luffy be the one to take down an admiral? To think that he first character to take down a navy admiral won't even be a pirate captain is just delusional. Especially with the past between Luffy and Kizaru. Zoro never stood a chance.
And seriously, people really thought Sanji will fight Kizaru while Zoro fights Lucci, what he's gonna do, get one shotted? He will be lucky to get a fight this arc in the first place.