Years ago I looked in to average IQ required for each offensive and defensive football positions. There is a direct and massive correlation between the races of the players and the positions. Because body styles are all over the place and can be considered evenly distributed among races (there are big and strong and fast White and black guys), IQ must be the defining characteristic for who plays in what positions. In short, the above statement is entirely correct in that if Whites were not to play football, blacks would have no place in the game - it just takes too much thought for them to handle. For more boiled down evidence, look at how many successful black quarterbacks there are. The minimum IQ of a successful quarterback is about 130. Really successful QBs are up around the 140 mark. Runningbacks, on the other hand, have an average IQ of about 90. This isn't to say no black people can be successful in the higher IQ positions. We all know how the bell curve operates. But I posit there wouldn't be enough blacks to properly populate the higher IQ positions needed in order to have a full set of functioning teams. Or maybe, at the pro level, it would all look like high-school football, with a ton of errors, flags, and poor plays. Overall it is much easier to put a ball in a hoop than to properly execute a complex play involving multi-layered strategy.