Because only Pac and Mayweather can deliver the biggest pay day of these boxers careers. Pac has a fight lined up. Mayweather hasn't fought since May last year and is due a fight. These cats are just trying to get in the picture for when he does come back. With Bradley, he knows Mayweather has a penchant for dragging smaller fighters up to 147 to fight him, so he knows he has a good chance at being his comeback opponent.
Floyd should go beat up emmanuel first before he fights anyone else. After that is done he can go fight anyone. Maybe even his baby mama again