Fascinating stuff. I read up on the Khosians. When showed pictures of other ethnic groups, they identified the Vietnamese as being the same as themselves. If you look at them they do bear some resemblance, and look more like them than they do their classical negro neighbors. It makes me think that both very dark and very light humans are the offshoots. The skull shape and other mongoloid traits are a different matter though.
I've read 2-3 books on them myself. They are the ancient people of Africa but, their myths would place their origins somewhere around the Mediterranean. I've read (somewhere?) that one anthropologist speculates that they are the leprachauns(sp) of Irish legend. They do have pointy ears, are reclusive and dance around fires all night, lol.