Hagler would have been made to look foolish, He wasn't quick enough. Roy was a lot faster and sharper then the Leonard who fought Hagler(who hadn't foughten in 3 years) and much bigger. Hagler would have had so much difficulty catching Roy because even with his iron chin he would not be able to just walk through Roy's shots. Roy Jones Jr fight similar to how he always did, move around and when the opponent closed the gap he would overwhelm Hagler in this case with speed and power. Roy was far more adept at doing this and not getting hit then Leonard or anybody else has ever been.