..naturally smaller than them. For example, PBF, who started his career at 130, versus Hatton, who started his at 140. Clearly, PBF is the naturally bigger man, even though Hatton started his career 10 pounds North of where PBF started his. Likewise, ODH, who is obviously naturally bigger than Juan Diaz, even though he started his career at 130, whereas Diaz started his at 135. Or, Hearns, who started his career at 147, but who is clearly bigger than Mugabi, who started his at 154. You see? The weight class in which a fighter begins his career is in no way a consistent indicator of the fighter's natural size relative to others. There's many additional factors that only an idiot would feel comfortable overlooking, such as the age of the fighter when he begun his career, his degree of physical maturity, the degree to which the fighter is willing to cut weight at the start of his career, etc. All of these and more are just as telling, if not more, as to a fighter's "natural size."