Again beating this dead horse but gotta say it again for fans to not get too high hopes unless Oda wants to make One Piece a power scale mess but Zoro and Sanji aren't ready to fight YC and top tiers and nothing prove that they are.
Luffy went through the development and got stronger each arc by getting intense fights while Zoro and Sanji are chilling and for them to jump from nothing to taking on YC ALONE would make absolute no sense in the story.
First we gotta remember who are the quality fighters that we should worry about and it's : Kaido , King , Queen , Jack , Page One , Ulti , Who's Who (?) , Black Maria , Apoo (assuming he ain't gonna snake Kaido and turn against him) , Fukurokuju , Hotei
My Predictions as of right now :
- Zoro goes up with Luffy somehow and fights an injured Jack who just came off beating the Dukes then teams up with the rest of the Supernovas to take down Kaido (and maybe he get the finishing blow idc) , also i would appreciate if Zoro gets to beat Hotei even offscreen as in his request to become the GOAT swordsman he hand't beaten many in his journey
- Sanji would would probably teamup with Jinbei to take on Queen just like he did with Wadatsumi (maybe Who's Who joins them in that fight as there's a storyline there) , and maybe he gets a secondary fight against Fukurokuju
- The rest of the SH i honestly don't know , their lack of Haki obviously means they can't compete with the remaining TobbiRoppo so Black Maria , Who's Who (?) , Page One , Ulti and Sasaki (?) so they will probably match up with fodders most likely
- As for King , I think it's pretty obvious he's fighting the strongest remaining fighter that didn't go up and that's Marco.
- Apoo has to go up and either he snakes Kaido and join the Supernova teamup or he fights Kidd up there