I think this started because Rory kicked the crap out of BJ.
In BJ's defense, he walks around at 155 (non fight weight)
Rory walks around at 190.
They met at 170 and by fight night, Rory looked all of 190.
BJ's problem, it you want to call it a problem is that he'll take any fight at any weight with anyone.
That and he just loves to bang.
If he would have stayed at 155 his whole career, and stayed with his world class BJJ, he might have never lost a fight in the UFC.
I don't know if its his trainers fault or he made the decision, but he stayed on his feet and banged 90% of the time, yet he is one of the most talented BJJ players in the world.
Either way, mad props to him for all he's achieved.