If the Mosley/Berto rumors are true... I think Floyd would fight the winner (To try & get his WBC belt back)
I just don't see him fighting anyone who would post a threat to him. That is how Floyd Mayweather rolls.
History tells you he wouldn't want to fight Pac/Mosley over other potential less threatening fighters. The faith people have in thinking Mayweather will risk that 0 to go is so naive and crazy.