Pacman is too small for this and Mayweather wont do it cos of the monies involved. Clottey, Margarito, Berto, Mosley, Cotto, and one other, the south african dude warrants it.
I don't ****ing know... that's what makes welterweight such a great a divison. They're such great and evenly matched fighters that you don't know who will come out on top. Upsets are a very common thing these days at 147.
I think there are way too many forces involved for there to be ever be a real Super Six tournament. That said? I could see Top Rank and GBP doing something similar together.
Mayweather wins he beats everyone in a round robin and beats Mosley a second time for the championship.