I think people forget that Manny isn't the same whirlwind against movement, we've seen Marquez and Barrera significantly reduce his offensive effectiveness and output by using distance.

Also Pacquaio can only use angles if Mayweather allows him to close the gap, otherwise the only option Pacquiao has is to come straight forward at Mayweather and Floyd will see him coming. In a fight between two truly ATG's I think Floyd is just too well rounded, and Manny will never have instinctive skills that Floyd possesses. Manny is truly great and already a top 15 p4p, but Floyd is better than him.