You're like Luffy's Nik. We need you.
The scar stretches all the from Kaido's upper left chest to the middle of the Oden's scar: You can't properly distinguish it because half of it is cover by Kaido's Tattoo while a part of it is mixed with Oden's scar.
The attack had Kaido shivering like a Covid patient on life support:
He acknowledges the attack and tells Zoro that he did enough—you seemingly can't read it due to ignorant glasses that you wear while reading Zoro panels. That right there received more recognition than any single hit move from Kid or Law.
Kaido started taking deep breaths the first time only after Asura—he wasn't even fighting here; he's breathing heavy just from talking.
He bled just from getting his attack blocked after Asura:
Any person who calls this a paper cut or says this did not significantly damage Kaido needs to see multiple doctors.