New Human Fossils found

Or, rudolfensis and ergaster could both have evolved in small, geographically isolated regions outside the notice of palaentology, at least up till now, before expanding back into the rest of Africa. Is there anything I've missed that argues against this alternative?

We are all still out of Africa. All this article is suggesting (if I understand it right) is that one African species of human - our ancestors - spread out and colonised Europe, whilst still maintaining gene flow with the African population. Eventually, the two populations became isolated reproductively, and evolved into sister species. The ones in Europe became Neanderthals, while the Africans became modern humans.The idea is that the shared DNA between Neanderthals and humans from outside sub-Saharan Africa is simply due to the fact that the more northern populations of Homo sapiens in Africa - the ones which later colonised the rest of the world - still had alleles shared with Neanderthals at a higher frequency than the southern populations who stayed in Africa, and so more survived till today. I remember somebody posted speculation along the same lines here when they first announced the interbreeding study.