I've long held that Mayweather would dominate Pacquiao. Ortiz? He's had one fight at welterweight. Come on now. :yep Life and death with Berto does not mean you can take Mayweather. Martinez can't make 147. So...nobody. I was never sold on Cotto and Williams as nightmare match-ups for Floyd, either (even when they were undefeated) - and certainly not Margarito.
Only Pacquiao I'd give a chance and I don't even favour him, but thats the only risking one out there now in my opinon
Pac-Floyd would be a 50-50 with Floyd having an edge in the physical game and Pac with the psychological advantage (Floyd fears Pac). Other than Pac, no one else at 147.
I don't really believe that; furthermore I don't think the psychological component carries the same 50% weight as everything else (which, as you say, favors PBF).