It is hard to get decent stats on those features, hair, eyes and skin color, you need a large sample, and the same methodology used. Look at the Ashkenazi Jews, they are a mix of Levantine, and SouthCentral Italians, yet they have more lighter pigmented people than either of their parentage. That could be because of the genetic bottleneck the AJs experienced or positive selection. As far as Coon, there may have been selection bias.