Ha, it is interesting you mentioned smaller players, where I'm pretty sure we're only picked very low because they're from Europe or was because of their height.
It maybe true, that a mean big body who can put up 50+ a year, is rare. Add to the fact that the average height of a NA or Uero people are around 5'11 to 6' which makes people around that size much more plenty.
So a player has more control to his skill, but could not control how tall they would grow(genetics, etc)