I think Hatton has never had the greatest chin probably to begin with, but that doens't mean he is worse than he used to be, I think his performance against Paulie was one of his best, and physically I have never seen anyone give Mayweather a more competitive fight. His speed really threw Floyd off.

Both of them IMO are close if not in their prime still, I think MAyweather will probably be around that same level for at least 4 more years if he continues to train as hard as he does(I hear he's been training since he retired, and he's been training very hard for the last couple months).