I thought our tall and slender phenotype came mainly from our proto nilo ancestors that developed in the semi arid savannas, are you referring to racial phenotype or current individual physical traits?
Our non-Eurasian ancestry isn't proto-Nilote, as we don't have Nilotic ancestors. Our Ancestral East African is not a actual component, and it does not represent any actual ancestral population. Once you look closer, you see it that it was never a single population, but represents several layers of admixture from several different populations through tens of thousands of years that is now grouped together simply because people don't care much about non-Eurasian DNA. It should only be taken to mean "non-Eurasian"
AEA as a sham component would support the diversity of Somali mtdna, one of the most diverse in the world. Our mtdna has relatively equal levels of M, L2, L0, and N. Only L4, L1, and particularly L6 are rare in Somalis
About our height and build, evolution isn't a one time thing, and populations are always having new traits introduced and selected. It has been around 4,000 years since we had any significant injection of non-Cushitic admixture. But I would point out that Somalis are very similar in build and crania to proto-Egyptian Naqadans, and are probably not even far from the paleolithic Ibermaurusian of Northwest Africa
Antithetical to what people here love to state as fact - Somalis and Cushitic peoples are not the result of Natufians + Nilotes. The Natufians had very different ydna from us, and their mtdna was not as similar. They were a local Levant/Mesopotamian HG population that had admixed with a wave of migrating northeast African HG's. We may have ancestry from them, but since M1 is the largest Eurasian mtdna we have, it makes more sense that our Eurasian ancestry was in Africa long prior to the Natufians, and is shared with the Ibermaurusians. The Natufians also had mtdna L2, so it probably wasn't only paternal northeast African ancestry that they had
It makes sense that Somali phenotype was heavily impacted by selection. The South Cushites were probably lighter than us. A a half-Nilote, half-Arab population would probably be lighter than us, since most half-South Sudanese don't resemble Somalis at all, but alot of fine featured Nilotes and blacker skinned South Arabians tend to
