The reason why people think Floyd has so much endurance is because he puts nothing in his punches and relaxes against guys who try to technically out box him... he's so calm in that situation.

In Hatton you have a guy who Floyd will have to throw hard punches at constantly for 3 minutes of every round in order to beat Hatton. He won't be able to relax as much either because he won't have the chance to. if he does Hattons body shuts will take more out of him.

Hatton has the best shot at beating Floyd of any one.