6'8" makes him slightly above average in the NBA. Comparing his height to the world population at large does not make sense if we are comparing him against other professional basketball players, past and present.
That's the point though, everyone in the NBA is extremely selected for height, and since we see him in the context of other NBA players we lose sight of how extreme this selection is and focused on traits that aren't particularly selected for, even if those traits are unique once you get past the previous selection
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