Bradley is a terrible style match up for Pacroid. I don't know if he's got enough to make it happen, but I would love to see the fight. Otherwise I think, Erik Morales, Medgoen Singsurat, Rustico Torrecampo, Juan Manuel Marquez, or Agapito Sanchez can all still make 140.
Bradley or Alexander, they can beat him because both are some what slick and till this day Pacquiao has never fought anything close to a legit slickster.
Bradley, Alexander, Maidana, Ortiz, Peterson, Campbell, and Khan would all most likely get KO'd by Pacquiao. I think Pac should move to 140 and start fighting this competation if the Floyd fight doesn't go through. A ton of great young talent at this weight right now and Pacquiao could really establish a top 140 lb. legacy over the next 2 years. At this point I think he is pretty content though. Who could really blame him? He probally wants 2 more huge paydays and then retire.
If Cintron somehow made 140 lbs he can find a way to weasel a 5 round technical decision win by leaping out of the ring
I think Bradley has the best chance, but it's still a very slim chance. If you want to include welters dropping down in weight, Mayweather has the best chance by a mile.