So you got nothing?
Kaido never said zoro has coc as far as I remember. He was wondering and asked a question.
Then Kaido didn't even talk about CoC or CoC users after Zoro's answer. He went to talk about worstgen instead of CoC users!
Compare it to when Kaido talks about CoC (& users) as luffy uses adcoc on the roof or CoC at Kuri.
Similar indeed...
and apparently Kaido and zoro clashed their weapons yet we got no CoC or haki burst!
Whenever Conquerors clash their blades or attacks for the first time...oda usually shows CoC burst or haki bursts emitting from the collision.
Linlin vs Kaido, Luffy vs Kaido, luffy vs Doffy, yamato vs Kaido, etc...
Let's see if Oda would state it on sbs or the new cards that Zoro has CoC. If not then RIP totally "zoro used CoC on the rooftop"