Some of the comments about Khamzat are truly crazy. "Generational" is one of the best.
What has he really shown in the last few years? The fact that he broke Whitaker's jaw with a choke isn't an indicator for me. It certainly takes strength, but a lot of it was probably also a lot of luck. Sometimes it just takes the right angle without much force. Or Whitaker helped when he tried to escape. Or both.
Otherwise, I can only remember two WWs against whom he had a lot of luck and one shitty gas tank. One a wrestler, the other a BJJ guy. Not particularly impressive despite his bigger size. If he had clearly defeated both with his "generational" grappling, then maybe. With Usman, there's still the fact that he came from the couch. And he still gave Khamzat a fight he could have won.
I'm much more impressed by what DDP has done in the last 2-3 years.