there is no math to do. you said ray only fought white fighters. i named 6 black fighters that he fought. there are more...those are the 6 that stuck out in my head. try again.
Tell me again what's the odds of Mayweather-Maidana? Then next is Khan... hmmm... pretty interesting set of opponents just like Ortiz and Guerrero.
and pac has mike alvardo up next a non-champion, pac just had brandon rios - a non champion floyd is unifying 147 at 37 years of age what is pac doing again?
Best and greatness are different things. Mayweather's ability as a fighter makes him one of the best ever. His failure to take the biggest fights means he'll never be one of the greatest.