The Japanese raw for 1012 uses the kanjis for several "ζ°" , ten "ε" ,minutes "ε" earlier ε , in the page where Law and Zoro fall and are caught by Sanji. Several 10s of minutes, is by definition more than 10 minutes, and most likely more than 20 minutes. I would consider 30 minutes to be the reasonable upper bound of this.
all that means is that sanji spent some time bandaging zoro after they exited the rooftop. there is nothing that says that luffy spent "several ten minutes" at the rooftop. and if you're looking into this much detail, i'm sure you understand that the timeline of onigashima isn't linear.
Chapter 1001- Kaido acknowledged him as a PK level threat, not specifically an adv CoC user, he used internal destruction against him with red roc. He didn't have Big Mom on his threat list.
He was talking about
luffy's ceiling and compared him to the likes of Roger, Newgate, Rocks, Shanks and Oden (all who are confirmed or most likely adv CoC users). He clearly doesn't compare him to the likes of Big Mom, Garp because 1) they aren't pirates who he respects, 2) they don't resemble luffy, either in character or in ambition or in terms of his ceiling.
Chapter 1010- You can't be a "potential adv CoC user" if you have fucking used it, you are a confirmed user not in full control, Luffy wasn't in full control after his off screen fight with Kaido, hence Kaido calling him sloppy later.
You think death door Zoro was able to muscle through and use adv CoC, but Kaido instantly after this happened, was under the impression that Luffy wouldn't be able to use it in that instance (but could do so otherwise, which goes completely against the wording he used when he talked about it and how Luffy talked about it himself as something he was understanding for the first time).
You do realize that Zoro very clearly says that he is putting his all into this one final attack to save his captain's skull from getting crushed. And by virtue of Enma drawing out his latent CoC with its properties, he is able to infuse and use it in that desperate Ashura to scar Kaido. When he tells Kaido that he doesn't understand what he's talking about, its very clearly implied that its a one time thing unless Zoro works on it and masters it.
And as we see in Marineford, people were talking about Luffy's potential when he, unconsciously uses CoC. The exact same thing applies to Zoro here as well, when he scars Kaido.
If you think Zoro used basic CoC in Ashura and basic CoC can scar Kaido, then explain how and why the only scar Kaido has is from an attack which is canonically confirmed to have been infused with advanced CoC. Kaido must've met / fought with so many other basic CoC users in his life. Why doesn't he have more scars?
You really think that its just a coincidence that Oden's Togen Totsuka and Zoro's Ashura Farce of the Dead were the only attacks to scar Kaido, ever, but Zoro didn't infuse Conquerors into his attack?