Hearns beats FMJ easiest out of all due to styles. No one EVER outboxed Hearns. You could out fight him but not outbox him. Leonard, Benitez, hell old Tommy even outboxed a much younger & bigger Lt. Heavyweight Champion in Virgil Hill. Just as fast as Floyd, taller, punishing jab and too much power. Floyd's never shown that he'd bite down hard on his mouthpiece and go to war. And, he can't outbox him from range either.
Leonard wins too. Benitez was every good a counter puncher and had more pop too. Ray beat him. Sugar via being far more versatile and more warrior spirit.
Taylor's too sloppy and wide open. If Chavez busted him up with counters, Floyd sharpshoots him mercilessly.
Donald Curry liked to look over his punches too often and kept his head too high. McCallum caught it and Floyd would too. Floyd by decision.
Floyd lacked the work rate or punching power to dissuade a prime Duran (135lbs) or Pryor (140lbs) and he doesn't move his feet enough to outrun them all night. Both pound away at his body, shoulders & arms and win decisions.
Chavez that beat Taylor at 140lbs is busier, heavier handed and walks through Floyd's fragile handed, low output offense to win.
Whitaker vs Floyd is the bout I'd pay NOT to watch lol. However, Pernell being a southpaw and showing the ability to go offensive when he had to leads me to pick him by UD.