You know I was thinking about this. Pretty soon UFC will probably put in a clause that they have to fight anyone and everyone specified albeit in the same camp.
The only two they will be hesistant is of course A. Silva and Machida since they both are champs. Especially for A. Silva since he may just end up dropping everything to pursue his life long dream of facing RJJ. Although I do respect that it is a conundrum. In other sports the competition may be fiercer than ever especially amongst friends, but nobody is trying to take their head off or break their arm. As fans of course we want to see every possible fight conceivable.
But really think about this if you were a fighter.
You'd fight if push came to shove, but would you try to KO your own brother or friend you came up with from the beginning. Psychologically I'm not sure the fighters will be the same before or after. The lines of true professionalism begin to blur. It's tough...