Yesterday, the promotional tour for the Floyd Mayweather Jr. vs. Miguel Cotto May 5 fight began and the main topic was the Mayweather vs. Pacquiao super fight that's scheduled for Nevuary 2013. Whether the top pound-for-pound fighters are going up against world champion boxers or mud wrestling midgets, it really makes no difference at this point because they aren't fighting each other. But who's to blame? Is it Floyd for turning down a 50-50 split? Pacman's refusal to agree to Olympic style blood testing? Well, we're going to attempt to get to the bottom of this. Who's Ducking Whom? A History of the Failed Mayweather vs. Pacquiao Negotiations.