@swamidass Josh, without getting into details which would be necessary in a more comprehensive and careful response (because Ken glosses some pretty important points that would need to be more detailed about which data drive the dating of a genetic pair and to which locale), I think the really important part to me* is where @KenKeathley leaves off. For me it is an issue of the image of God. All humans are created in the image of God. A genetic model solves this problem. A genealogical model does not.
*Others at RTB would place the importance on the historicity of Adam and Eve on additional reasons, perhaps of greater or equal importance to that of the Imago Dei (image of God).