These are the fighters that haven't won world titles, So Berto/Bradley/Khan type fighters are out.
Gamboa still counts as he has a regular world title because Chris John has the super world title and Gamboa the vacant title (Berto also beat a can for the title but has since faced Forbes, Collazo and Urango)
Some suggestions are; Lara, Gamboa, Rigondeaux, Mares, JCC Jr. Angulo, Ortiz, Kirkland, Jacobs, Ward, Dirrell, Martirosyan, Andrade, Brook, Peterson, Korborov, Wilder etc.
I may put a poll up depending on whether there is no general consensus.
JML is the best prospect out there... too bad he won't for arum to make the caballlero fight.
I wouldn't say Lopez is still a propect. He obvious is a littel green and is coming up to his prime but he has a title and has destroyed Penalosa and De Leon. I would love to see the Caballero fight though