A scar isn’t something that heals instantly though, it takes time therefore inflicting damage that will eventually leave a scar is lasting damage. Kaido has high durability and high endurance, him not being on death’s door after the attack doesn’t mean it isn’t hindering him at all.
What you mean as "lasting" damage is the fact that the skin will have that scar forever and you are merging it with the "lasting damage" stuff like in my examples about Lucci or Zoro.
Two completely different things. The first one is irrelevant for the combat power since it doesn't affect the user display at all, the second is the one that matters.
Zoro for now is in the first case. That's nothing impressive since any Scabbard (or any character comparable in power) could make the same if they had CoC since all of them can wound Kaido. Togen Totsuka of them did more damage to Kaido than Zoro's Ashura by far, but they couldn't make him more ugly forever. That's the only difference.
No normal coc is always a coc burst like even unconsciously like luffy in Impel Down to wolves or on amazon lily where even the spectators saw and felt it.
Even kaido says nothing of coc until he's hit by the attack. Zoro coated his attack in coc unconsciously
Normal CoC without hitting = a "mental" attack
Normal CoC by hitting = a "physical" attack, Luffy vs Doffy, etc used this unconsciously.
What's so difficult to get lmao?