who would win and why .

[Dark Lord Al]

I think when it's prime vs prime:

Pavlik beats Roldan UD
Fenech beats Barrera UD
Hagler beats Toney UD
Hearns beats Mosley TKO late rounds
G-Man beats Ketchel KO
Jackson beats Monzon KO
Mayweather beats Pryor SD
McCallum beats Taylor easy UD
Olivares beats PacMan SD
Hearns beats Calzaghe KO middle rounds

Proyor stops Mayweather late rounds , apart from that i agree