Dude, stop. This is the same thing that happened with certain people (Prince Kronos) trying to say that Sanji didn't know Yamato had momo, so that MUST mean the story will dictate him back to Momo and thus King because King was SURELY going to go and directly attack Momo.
Stop trying to mind-read characters and actually read what is on the page. Zoro left it Luffy and said as much. Zoro said to head to the performance floor. Sanji said to Chopper to heal Zoro so he can help with the fighting.
None of that ever alluded to him going back to fighting Kaido. The pure fact is thT it doesn't matter what you think Zoro is thinking, is the fact that he would 100% be redundant in holding off Kaido because Yamato is already doing it.