Hatton wasn't past peak, he just met the very best version of himself in Manny. Besides, Hatton was too big for 140 and too small for 147, yet still had some success at the weight. Manny was just levels above him then. Styles make fights, I'm afraid.
Both and he was also terrible against left handers. He never looked good against a single left hander he faced from Mcgee to Thaxton to Collazo and Pac.