Okay so as I understand it, the current admixture model proposes that all modern non-africans have ~3% of their DNA from Neanderthals because they interbred with them after they left Africa. But doesn't this necessarily entail that ALL humans who left Africa interbred with Neanderthals, or that all those that didn't interbred died out? If the admixture model is correct some non-african populations should have significantly less to none Neanderthal DNA because their ancestral branch didn't interbred with them, BUT this isn't the case, ALL non-africans have the same amount Neanderthal DNA

Wouldn't this mean that the Neanderthal DNA is from a common ancestor between Neanderthals and modern non-africans, not admixture? That means modern Eurasians did not evolve in Africa, but in Eurasia, as sister taxa cannot be separated by place

>inb4 ancient population substructure
No
https://academic.oup.com/gbe/article/5/11/2075/652402
https://academic.oup.com/mbe/article/29/10/2987/1029326
https://www.cell.com/cell/fulltext/S0092-8674(20)30059-3