Zoro can fight Kaido in the gang bang if wants. We all know a certain someone will steal all the shine. It will be the Bullet fight all over again.
Anyways I'm fine with ma boy Sanji defeating the chicken worth 1.3B plus bounty. That's the figure Sanji will be rocking after Wano.
Every time Zoro has been involved with Luffy, he has stolen his thunder
Don't forget that
Introduction arc he took out Main boss
Thriller Bark, he was portrayed as superior one
In movie where Luffy and Zoro were involved with main boss Zoro took him down
Against Hawkins, Luffy was on the side line.
You better hope that Zoro doesn't tag team with Luffy because if he does, its damn near a foregone conclusion that he is the one killing Kaido