That's to be expected, I think. A mostly-dark or even a mid-dark population would have trouble out-competing mostly-light populations over time due to issues wi

That's to be expected, I think. A mostly-dark or even a mid-dark population would have trouble out-competing mostly-light populations over time due to issues with internal discord. The accuracy of such tests is of course as suspect as for g, but I would expect that for optimum competitiveness, there has to be at least a small amount of this kind of variety in any society, tending much more towards light than dark.