Arum says that Pacquiao has had this injury since 2008

[Gandalf]

I don't believe that, but looking at Pac's combo's in this Canelo replay, you can see quite obviously that his right hand is limp. The left lands with force, but the right is thrown in a faggy, prodding, way off of the mark way. More than ever, I am convinced that Pac was fighting with one arm. That he was level with Mayweather at half way kind of makes a mockery of Floyd. I think Floyd gets beaten up badly in a rematch and Pac is going to be as mad as hell. Expect Floyd to work on his octopus man routine. Bwahahaha at him needing that against a man with one arm! You better retire again, Floyd!

[Gandalf]

That's why Floyd was twisting the arm and Mayweather senior was saying 'You fighting scared'. They knew he was fighting a man with one arm and he was still fighting scared! With hindsight the replay is very, very funny. You connect all the dots which just made no sense in the live fight.