Oh, yes, and there is a good reason for it:
There is evidence suggesting leaving a permanent scar on Kaido means you did significant damage. Anything else is considered too shallow. Now you have to prove Luffy too inflicted significant damage to say he has done more damage. And we don't have any metric to confirm that for us.
Besides, Zoro's attack received much more recognition than anything Luffy has ever done to Kaido from one hit. For one, Kaido regretted getting hit by Zoro, which can be observed from him being visibly distressed while holding to wound and saying, "Damn it," up on getting hit.
He was visibly shaky in the middle panel. This never happened with any other attack he has taken. He usually just takes the attack and proceeds to fight. He doesn't take time to admire the attack or the damage.
He started shivering after the cut indicating it's taking a toll on him:
He started taking heavy breathings—for the first time—even when he wasn't fighting anyone—emphasizing the toll it's taking on him.
It was so bad that he started bleeding from the nose just from blocking an attack:
Obviously, he was able to withstand the attack and continued fighting. But no other attack that landed on Kaido before Luffy's awakening received this level of acknowledgment. Bear in mind that Kaido is far more injured when he's hit by OKG than he was when Asura hit him, yet he shrugged OKG off like nothing.
That's no more than a false equivalence and a failed attempt at lowballing the feat. Luffy's attacks forcibly knock down people while what Zoro was looking for is to knock Kaido off his feet via damage as he did with Kaku:
This is how Asura works. It doesn't send people flying with extreme force. Lol, Luffy's attacks target Kaido's internals, which by default makes them pretty lethal too. Luffy had a prolonged battle with Kaido while Zoro had an encounter that lasted like 3 seconds and he still did more damage than several attacks from Luffy combined, and he did that with crude CoC to boot. There is no comparison there.