I love Marvin. Exciting fighter who came to fight, but he did want to fight the guys at the lower divisions like Hearns,Duran,Leonard. I would have liked to have seen him test himself moving up to Spinks. People say well he was too small. Look, Hearns had a reach of 78 1/2. Spinks was I think 77,,, and Hagler? you would think was 72, it was 75 inch reach. He could do ok.
Tommy Hearns is my all time favourite boxer and I believe at L/H he would have schooled the Marvelous one with his superior boxing skills and better physique at this weight. Marvin would have struggled at this weight IMO, although I still say he's the best Middleweight of all time.
I think Hagler wins a rematch at middleweight but Hearns wins at lightheavy. As the weight increases the body structure differences favour Hearns.