How much pressure does Mosley have to beat Berto or risk losing an opportunity to fight Manny or Floyd?

Maybe we are talking about a different Shane Mosley because the one I am talking about is considered by many the greatest lightweight ever and undefeated in that cl. Moved up two cles beat Oscar and was pound for pound king years 2000 and 2001. He will go down in the sport with the highest honor which is to be called a 'legend', that's the next step p Hall of Fame. No pressure for Shane, he's been fighting since he was 8 years old, boxing is like walking to him, besides Berto pulled out.