Way cool. Me, I've never even got close to being able to dunk.
The thing is, a small difference can make a huge difference at the very highest level. Take the two nearly identical bell curves below of 'dunking capacity', with 'litlle jump capacity' on the left, and 'Michael Jordan' on the right (the 'gifted area'). Neraly half of all reds are better than nearly half of all blues. But, because the top of the one curve is slightly more to the right than the other, in the top and bottom percentiles, and even more in the top 0,001%, the differences between the two groups are huge, even if the averages are very close indeed. This explains why specialised, 'single determining factor' athleticism at the top is so monocultural.
In the picture below, imagine that 'NBA level basketball' would require a gifted capacity of 130 or higher. It now becomes clear that even though red and blue don't differ all that much, at NBA level, blue is very dominant:
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