1. Bullshit. Zero proof that zoro had coc before luffy. That is headcanon.
2. Also bullshit. If coc was in zoros attack that would imply that he coated his blades in haki which would be advanced coc. We know that zoro at that time did not have since kaido was in shock that zoros captain luffy used it in the same chapter. So again bullshit.
3. Also bullshit. We see the black lightning when zoro knocks out the fodder that was with king that implies that zoro used coc. So again bullshit lol
4. 0 indication of zoro having coc before luffy lol. The only reason why you believe that is because your dumbass still think ashura is tied to coc itself. Otherwise you would say that dumb shit since luffy has shown more coc feats pretimeskip before being confirmed a coc user (knocking out fodder with a glance etc)