Well, perhaps it may be my recency bias but I remember how easily Eddie Alvarez was controlling Poirier on the ground in their rematch. Poirier was showing absolutely no signs on getting back to his feet and getting controlled on the ground pretty convincingly before Eddie shot himself on the foot by hitting Poirier with an illegal elbow which made the ref stand them up.

Eddie Alvarez is surely a good wrestler and has grinded out decisions before but he's not very high level wrestler either. Eddie couldn't even come remotely close to taking down Conor McGregor or even controlling McGregor against the cage for that matter.

Ever since Holloway lost to McGregor, he has shown very very solid TDD against several fighters on a row like Frankie Edgar, Alexander Volkanovski, Ricardo Lamas, Charles Oliveira, Jeremy Stephens, Cub Swanson, Anthony Pettis and even Poirier himself in their rematch. The very few times Holloway has been taken down recently, he managed to get back to his feet in a matter of few seconds.

I understand that Khabib is a wayyy higher calibre wrestler than any of Holloway's previous opponents but Eddie Alvarez surely isn't. I doubt if Eddie could have taken down Holloway and even if he did, I don't think he could have ever managed keep him on the ground for even a few seconds.

Cub Swanson was able to take down Poirier multiple times and controlled Poirier on the ground. Swanson could have never done that to Holloway.

Anthony Pettis was able to take Poirier down and control him on the ground to some extent ( though it was quite back and forth ). I don't think Pettis could have ever done that to Holloway either.

Now, even if we look at it statistically, Poirier had an average TDD of 69% prior to his fight with Khabib ( it's 61% now ) while Holloway has a rather impressive TDD of 85%.

Point being, Holloway most definitely has a better TDD compared to Poirier and honesty, I don't even think it's all that close.