The "Hatton was never comfortable at 147" myth..

[Jimanuel Boogustus]

He was a smallish lightwelter weight and even smaller welterweight. His strength won't be much of a factor at 147, making him a bit of an unfortunate infighter.

I definitely wouldn't say he was a small light welter. He almost looked drained at times at 140. Those cold sore outbreaks he used to get on weigh in days are a sure sign of his lowered immune system..possibly due to weight drain?

True but he was never physical big at the weight come fight night. Case in point - Castillo who was a monster at135 was a lot bigger than Hatton come fight night. Hatton is not a physically awesome guy at 140 and looked deminutive against even Floyd Mayweather at 147.
If Hatton had of fought Katsidids, I doubt there'd of been much if anything between them.