I like Robi in a one off, but like some are saying it's not so clear cut as people make it out. Duran is the worst style for Robi, and I don't think Robinson is that much better than Leonard. The difference is pretty small. Guys like Gavilan, Basilio, Fullmer, LaMotta etc; don't have the same skills or smarts as Duran, but they do have superior size. Guys like Angott and Zivic don't, but they also didn't have the same success as the guys above. I think that Duran definitely wins 1/3 if maintains his Montreal form.
I wouldn't count Roberto Duran out, but only one of these men would have to fight a perfect fight to win.