Pink got it right on in the post. To put it in real life terms, just think of NBA rebound leaders. Most of the time they are taller, but if that is the only criteria, then Yao Ming would lead the NBA in rebounding. He has an advantage, but it is still a skill that needs to be trained. That's why a guy like Charles Barkley is able to lead the NBA in RB when he was much shorter than 7 feet. Barkley's BB manager trained him in Rebounding when he was young, and it paid off.