[tptacek]

You're not even telling a coherent story at this point. The "cold winter theory" isn't merely that the populations are different (though: again: when you look at the molecular evidence and the way genes propagate, it's nowhere nearly as clear as you'd think), it's that the cold winter populations are smarter. But you have to literally ignore most of human history to reach that conclusion. Somehow, in this view of the world, evolution only kicked in a couple hundred years ago. Seems unlikely!