One of the reasons I've always been drawn to weight-class sports like boxing is because they provide opportunities to great athletes of every size and shape. Boxing and wrestling have always shown a spotlight at the elite level for guys who just wouldn't be big enough to make it in sports like basketball and football.
And throughout the history of boxing, the highest percentage of pound-for-pound stars have competed between welterweight and middleweight. There's simply a bigger pool of talent to draw from in those divisions. The highest percentage of adult men, if they are training with the intensity of a professional fighter, will lean down to the welterweight-middleweight range.
But great fighters come in all sizes. And there are some surprisingly competitive weight classes in the sport right now.