We're talking about a world class athlete who has to cut weight to make the heavyweight division...the man is a monster (and not just weight, look at his reach...81" at 6'3"
He knows how to train, whether or not he is coachable remains to be seen. Still there is no question that he has the potential.
I think his biggest weakness will be Jiu Jitsu...even a guy like Tim Silvia, who has way more experience, and trains in a top camp still struggles to protect himself from submissions. If he learns how to protect himself I think he can use his sheer size and strength to dominate the division...eventually.