I still don't understand why people want Sanji to steal Usopp's match this arc. Usopp's going up against a Flying Six, Page One, and people wnat Sanji to randomly show up to steal Usopp's opprtunity to prove himself?
I've been saying I'm fine with Sanji vs either Calamity. Sanji vs King as they both specialise in aerial combat and they already clashed or Sanji vs Queen as Queen fits Sanji's usual arc opponent, because of the Judge connection and because he outright said he wants to take down either Sanji or Zoro.
We'll likely see in a few chapters who Sanji's arc opponent is.