Tom Szczerbowski-USA TODAY Sports
This is the most interesting category.
When it comes to Chris Weidman, the biggest X-factor he has going for him is his steady growth in the sport. While it's hard to tune out Joe Rogan yelling "they better every time they step into the cage," it is actually true for Weidman.
Where things get really interesting, though, is with Vitor Belfort.
"When the going gets tough, the tough get going" may be a tired tautology, but it rings very true when it comes to analyzing fighters. When the going gets tough, Demetrious Johnson gets going. Jon Jones gets going. Ronda Rousey gets going. Mark Hunt, Antonio Silva, Diego Sanchez, Georges St-Pierre? They all get going.
Vitor Belfort, the majority of the time, does not get going, and gets swallowed up by whatever fighter drags him into deep water. Sometimes his tentativeness leads to an emphatic knockout like the one Anderson Silva laid on him. Sometimes he simply crumbles as tougher fighters like Randy Couture, Tito Ortiz and Jon Jones press him.
As if that wasn't enough, the TRT question is a critical one. As we saw with Matt Riddle, once you start using, it is very easy to convince yourself you need it. If the fight takes place in America, which is a legitimate possibility, there's a good chance Belfort will have to quit the TRT that has helped him bulk up to the enormous size he walks around at today. Will that weigh on him entering the cage, and if so, how much?
Those three factors all favor Weidman and because of that, he finds himself with a major advantage in terms of X-factors.
Edge: Chris Weidman