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Dennis Rodman was a very SMALL power forward. He was 6'6". The average power forward is 6'10".
Basketball is a game that relies even more on raw athleticism than baseball. And yet the greatest rebounder of all-time by a long shot was a runt compared to his competition.
In random pick-up games between average joes, talent gaps can be huge. Everybody in the pros is talented. When you get at that level, skill is often a huge facotr.