Mayweather has the right to ask for whatever he wants, as does any other fighter in the sport. If he is to be opposite another man in the ring, he has every right to make sure that guy is 100% clean as not to risk any serious injury. If the opponent has a problem with taking these tests, so be it. But Mayweather is certainly not out of line asking for them from all his opponents. Mosley has already said he would submit to such testing, so there should be no problem there.

Mayweather also gets the lion's share because he is simply the bigger draw at this moment. If the fight were to happen back when Mayweather first called out Mosley in 99, Mosley would've rightfully gotten the lion's share. Again, it seems Mosley has acknowledged Mayweather is the bigger draw and has no problem with taking the smaller share to make it happen.