Law used a Devil fruit ability that Zoro doesn’t have. This isn’t dragon ball.
Ok sure, Zoro can. But Ashura is literally a last resort, and I can’t see him using it at the start of the fight.
Ashura is Zoro’s final attack. Thunder Bagua is not Kaido’s final attack. We also literally just saw Kaido spam back to back COC attacks against Luffy.
So yeah, if Zoro decides to use Ashura immediately, he can probably injure Kaido which I guess you can count as a mid diff.
But I don’t see Zoro doing that, which means he’s going to overwhelmed and defeated really fast.