The alchemist
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Responding to this highly interesting post by @Reformed J, I will have to post what I think about it:
That Somali could have a direct Chado-Berber node ancestry.
My assumption is movement from the Libyan-Chad region by people into northeast Africa Nile-Valley by people who resembled the first Abstract on @Cognitive's thread.
I think a strong contender is a Kiffian-type migration, related to those 6-foot-plus-statured groups that lived contemporaneously as that TMCRA age. The material objects on the sites were Dotted Wavy Line pottery, very characteristic of a north and Sudanic type pottery, and utilizing harpoons -- these were attributes common among the hunter-fisher Sudanic peoples that subsisted on aquatic resources prior to pastoralism/agriculture. This pottery inside the Sahara (west of modern Sudan) was demic with the cultural horizon, but it's hard to say how the initial introduction of the Dotted Wavy Line (oldest in Sahara, but Wavy Line, a separate pottery type in the Nile Valley was likely the source of all these pottery traditions as it has an older dating and assumed as origin by the experts) transitioned from the Sudanic region into the Saharan region. I think a mix of cultural diffusion and demic diffusion.
Now, you had this Dotted Wavy Line phase all over the Saharan-Sahel region during the Green period, showing itself in the immediate vicinity of Takarkori by that Southwestern Libyan Uan Muhuggiag mummified child (probably the forerunner practice to the Egyptian mummification), some two thousand years after the samples on the abstract. Evidence points to that the people of Takarkori had the same pottery. These groups who had basal N1 mtDNA morphologically looked similar to the groups in Gobero.
The conclusion is, that this guy's Y-DNA originated from these types of people, the Takarkori samples will cover the genetics of the Gobero and the Somali in question's ancestor's autosomal makeup. Further what this means is that those kinds of people moved into the Nile Valley. The fact that they had the same pottery and marine-based specialization means they had contact with the early people of the Nile Valley. I'm not sure if this facilitated genetic exchange by any of these groups at first but we see the results of this amongst the Saharans today.
The pottery came from the Nile Valley, and when you see the earliest appearance in the region of the Takakori samples, it sort of coincides with the TMRCA of the haplogroup you showed:
What we have is highly mobile people that enjoyed the Green Sahara places until things turned extremely hot and dry, so they scattered into major places with consistent resources or refugia spots within the deserts, and some of them went towards the margins, northeast Africa, and as one showed West African, and northwest Africa. I think this is a reasonable dispersal hypothesis.