MY MONEY IS ON KHABIB IN THIS THEORETICAL MATCHUP!!!
I can't comprehend his ability, skill and stamina for him to be able to be that relentlessly overwhelming for 15 straight minutes. (In Mel Kiper voice) I'd be hard-pressed to think that this guy couldn't withstand walking through bullets. Bullets fear him. A grizzly bear has no shot against this guy. He would wear the grizzly down and the grizzly would need to hibernate by middle of round 3.