Nice write up OP. Unlike most of the people(maybe?) that post information on human origins the terminology you use tells me you have at least a base knowledge of anthropology. I remember a few years ago in my anthropology and archaeology classes the main theme that my professor was trying to get across to us were that the theories of human beginnings are still nothing but theories. She would even reiterate what the definition of a theory is. So basically the themes of "we don't really know" and "we currently accept this because its the best we got right now."