Define "natural weight division"? Even in the days where they weighed in on the day of the fight, guys used to cut weight. Floyd fights at welter and pretty much weighs the same the next night. I think the hype about guys cutting weight is over done. If you can weigh in on the assigned weight the day before the fight and put on 20lbs in the next day,more power to you. Theres negatives as well as positives to doing it. Some guys can do it and be huge and powerful in the ring the next night, some drain themselves and cant fight at 100%. I dont see the big deal.
carl froch, also david haye fights at heavy with a weight hes comfy at not like most who just pile on the pounds