Ali got dropped by bunch of cruiserweights when Frazier and Cooper KD'd him. They barely weighed 200 lbs. Wilder has only got dropped by very heavy superweights when Nichols and Sconiers dropped him. They both weight between 300 and 450 lbs. Now we could say Wilder has much greater chin than Ali did.
The Worm was too elusive for Ali. Nichols excessive sweating basically coats himself in vaseline/butter
Ali had never faced a thug like Nichols. He would get badly bullied https://www.rapsheets.org/mississippi/columbus-jail/NICHOLS_DUSTIN/30s70613201791057AM
You haven’t seen it tested on the level Ali was. Let’s see these guys even go 15 rounds while getting hit.