Roy fought about 15 pro bouts as a Middle. His best win was probably against Castro who was a veteran fighter on the fade! Roy was fast and on the move as a Middle but he developed into a good fighter after he grew out of the class! He fought light hitters and no one who sustain any pressure. His best weight was 168 to 175!! At 160 I doubt he'd fair well against Hagler, although Hagler would have promblems with Roys speed!
If your going to look at Roy as a Middle you need to remember he was a "green" fighter he wasn't the thinker that he developed into passed the middleweight limit. Ray.