For starters, can you provide feats based on which Ace can replicate or surpass a similar level of damage?
And no it's still an impressive feat of AP.
In the battle with the scabbard's, Kaido emphasized that "there will be no more like Oden" and that the scabbard's attacks are "too shallow" which "don't even have enough power to open the old scar". This already sets a high standard for such a feat.
After Asura, Kaido was shaking and surprised/angry about the wound, asking if Zoro had used CoC.
Even though Zoro didn't get what he wanted Kaido says it's enough pointing to the scar.
So this feat is good both because of the portrayal it gives by referring to Oden and for actually recognizing heavy/deep damage.
Yeah, after taking a part of Hakai to save Supernova on the roof. How exactly is that anti feat?
Especially in comparison to Ace.
1. That ABC logic is not an argument for belittling Zoro's feat. He may be weaker overall but in the AP section? No.
2. Marco could hold off King+Queen who used the minimum of their arsenal.
While still impressive, he didn't leave them any serious damage and left the fight due to his stamina limit.
1. You give the example of a fight part of which was off screen.
2. King can literally replicate this feat thanks to his flame that was hyped because of its similarity to magma.
Not to mention it's a single skirmish which doesn't speak to the level of strength as a whole.
3. King was in the worst condition due to the loss of the sword he used to conduct his "magma like" flame. He lost his wing which greatly reduced his mobility and his mental state was crap (which affects fighting ability as has been emphasized several times in the story) due to the defeat of Kaido with whom he had a close relationship and to whom he promised not to lose.
Unlike him, Ace still had his arsenal of attacks+motivation to fight for Luffy.
These feats are no better than taking part of Hakai and still fighting and then still being conscious after hit by a TB hybrid Kaido.