Given the speculative & inconsequential nature of the Paleolithic, no alleged mixing should be considered to compromise the principle of One Drop Purity, & focus should be placed on the Biblical standard: an Anno Domini era purity benchmark.
Christ & his Apostles all preached exclusively to Caucasians; not to a single Non race & then said it was done. Whatever we were at that point, God was satisfied with & the White race (Europeans/ diaspora) alone descend purely from those people: whom we can reasonably surmise absolute purity, & prior to is unimportant speculation that we investigate for further understanding, not further standards.