Man I think Cotto may end up being the best of the decade. There are tons of good fighters around welterweight that he can compete with to build resume, hypothetically that is better than the others on the list.

I don't think that PBF can beat Cotto or the elite guys at 147 nor do I think he wants to. I dislike PBF and will not hide my bias. I think he cherry picks and will continue to do so (as evidenced by his fight with Hatton instead of Cotto).

Ricky Hatton can't fight effectively (ever) at 147 against real full fledged welterwieghts. Having said that, as good as Ricky is at 140, he could stay there and reign with a legacy similar to KT (although not with the longevity of KT).
Calzaghe is old and only has 3 fights at the most remaining. Assuming he beats Kessler, he will have the best by far of any resume of those listed.
Manny Pac is tied with Joe on achievements I believe, but Joe has reigned for a long time (which I wieght heavily). Pac Man can easily fight some more future greats to secure himself as the greatest, as Morales and Barrerra fights are nothign to pass over. It remains to be seen how good Pac-Man can continue being, however I think he could have a nice looking resume, esp with the match-making that has gone on to date. JMM is a question that Pac should prove, but doesn't equate business sense.