Very interesting.
The origin of humans in Africa has been the dominant theory for some time. First, I think, because it ties in with the Darwinian view of a rise from more primitive beginnings. And Africans were, in the Darwinian view, the most primitive peoples. Second, and more politically correct as the intellectual culture evolved, it makes Africa more important.
But the samples are really extremely small. It’s only blind luck that bones and teeth survive in one place but not in another, or happen to be found in one place but not another.
So, we should keep in mind that all these broad reconstructions are only theories, and theories without a really firm statistical basis.
The traditional understanding of the biblical account is that God created Adam and Eve around 4004 BC. So 200-400,000 years doesn’t fit that time pattern very well. But it would be interesting if they moved closer to the traditional geographical pattern.
Take a closer look at Genesis 1.
Day isn’t and can’t be delimited by our Earth day http://strongsnumbers.com/hebrew/3117. as the earth doesn’t get a sun until the 4th Day (Yom - period of time) http://biblos.com/genesis/1-16.htm
Human’s come on the 6th Day (Yom) http://biblos.com/genesis/1-26.htm
Eden doesn’t happen until God rests for the 7th Day (Yom) and Adam get’s place there in Gen 2.
Bones & teeth are found in areas where the conditions permit preservation through fossilization. This doesn't happen everywhere, so we tend to find the really old stuff in dry, desert areas. This doesn't mean that such things didn't exist in other areas where natural preservation did not take place.