Silva has OUTSTANDING stand-up for an MMA fighter. He's actually a MT fighter so it makes sence. But he's be so far outclasses by Roy in boxing that he'd look horrible.

Roy would have a better chance at making a fight of it in mma than silva would have at boxing because in order to get your hands on roy to get him down you fist have to get passed his punches, and he'd land easily. But silva would eventually get him down... but not before roy did some heavy damage.