General & Others Zoro and Sanji aren't ready.

There is no correlation between those situations, Zoro has yet to damage Kaido and a 1 vs 1 is completely different from partecipating to a 5 vs 2 (that most likely is going to become a 5+ vs 1 nerfed emperor)
Zoro's going to damage Kaido though anyway. 2 Yonkos are still going to give all 5 a very difficult fight which means someone like Zoro will need tools to be able to cope to some degree (look at how Oda pulled out firefox style for Zoro out of nowhere). And if that's a case I don't see how he's not on the level to be able to fight a YC 1v1.

The end of Wano will signify the start of the endgame, where Zoro should only have difficulty against fellow SN, YC1 and above characters.
 

Doggo

Talent is something you make bloom.
Although Sanji have always been strong, he never had the "training vibe" Luffy and Zoro did.
Despite Zoro not facing any YC yet, which should have been the next step, using him as a helping hand against the yonkos, on the supernova team, it's not unreasonable.
Sanji would make less sense there. Raid Suit proved to be a good enhancement tool, that made him toy with a flying 6. But does it mean he can take a YC? or help against a Yonko? He still needs more "proof" than Zoro does.

Sanji vs King team here. I believe.
 
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