These are 3 close fights, IMO. I'd give Floyd the edge over The MOtor Cobra city, I'd say that it's toss up against Leonard but he would get killed by Duran (in the category that made him a legend, at least); Floyd wouldn't cope with his smart agression and tremendous power and Floyd himself doesn't have the power to slow down Mano De Piedra.

Still, that would be 3 awesome fights.