Hatton has been doing this his entire career, not just for this fight. Oscar, on the other hand, hadn't been a Welterweight in many years, and aside from that lost the weight ineffectively, by doing it too soon and not just for the weigh-in.
Yes this is always the case . . . and so with the veteran fighters who suddenly "hit a wall" and suddenly cannot lose the weight they usually lose without any problem. I don't have to go far . . . just to mention the most celebrated cases . . . Luis Castillo Chico Corales Guzman Campbell A person's body doesn't always react the same especially when the person is aging. Having said that . . . good luck to Hatton on going down to the 140 lbs. :yep