"Midget" refers to height, not weight. Hatton's style was predicated on drying out to 140 and mauling the smaller men in that weightclass. Floyd liked to enter the ring at around 150 which would've been a typical weight for a 140 pound fighter on fight night. I believe Floyd was still capable of making 140 at that point without much issue, so to me it was a fight between men of similar size without pressure to dry out. I'd be really surprised if Hatton didn't enter the ring weighing more than Floyd.