He used CoC coating. We know it’s basically required at this point to do any lasting damage to Kaido. As someone who’s been doing that shit for a long time, it would make no sense for Kaido not to recognize someone using CoC. That doesn’t mean asura IS the manifestation of conqueror’s haki, it just means Zoro subconsciously coated the attack with it. Using basic conqueror’s haki behind your attack doesn’t give it any boost unless… we want to make the argument that Zoro is strong enough to do lasting damage to Kaido without advanced CoC? I’m not sure if y’all like this option lol, that only makes Zoro look even stronger.
Lasting scar =/= lasting damage
Two completely different things.
Lasting damage = what Zoro had after Mihawk's fight which troubled him in some moments in his fight against Hachi.
Kaido is not hindered at all by Zoro's attack from what we saw until now. When we'll have a Lucci's moment with him (when his legs failed because of the lasting damage of the G3 from Luffy), then you can say Zoro did lasting damage.
For now, CoC, or whatever he used, is simply the means to block Kaido's regeneration. He can't fully heal scars inflicted by CoC imbued attacks, that's all.
None of luffy chinjao or kata infused coc
They were emitting coc bursts whilst they were fighting that's all basic shit
Hence why people watching could feel the coc
Zoro did no such thing
Or else law would have said so like he did when luffy and doffy used coc
Zoro coated his attack in coc
And yes kaido freaked out no care my ass
Difference is luffy knew how to use it zoro didn't
The CoC bursts are because they both clashed attacks.
Zoro didn't clash any attack with Kaido, he cut him cleanly.