Respectfully, to compare this to the Reer Gibil-Cad minority among Benadiri Somalis is absurd. That is a tiny subgroup of people historically isolated to a handful of coastal settlements who are of incredibly diverse origins (~20% Desi, ~5-10% SE African Bantu, 20-30% Arab/Iranian/Central Asian, and 30-40% Somali) and whose diverse origins are not found in the wider Somali population outside of a few people neighboring them in Koonfur who can usually recount to you that their ayeeyo or great grandfather or something was a reer Gibil Cad.
These T-L208 people—in comparison—are found all over the Somali gene pool. Even E-Z813 Somalis living hundreds of miles away will pop up with relations (IBD sharing) from Woqooyi who have this lineage and J-P58, which might very well be related to it in its introduction for some of its subclades, is also found all across Somaliweyn at low frequencies as is the mtDNA HV1b1 evidence that @Garaad Awal pointed out on Twitter recently along with probably a couple of other mtDNA lineages we don't know about yet. This is a group that fully assimilated into the overall Somali genepool and assimilated into the culture as a whole; as in, not just in some coastal settlements but fully integrated into the rural pastoral and agro-pastoral culture.
You're comparing apples to oranges here.
What distinct culture? Can you describe it or point it out in any way in relation to T-L208 dominant Somalis? From where I'm sitting it seems to me that anything distinct they may have brought with them has become mainstream in Somali culture all across Somaliweyn. That is to say, I suspect they may have something to do with the introduction of Camel-pastoralism, asiatic admixture in our bovines and caprines (for example, Zebu admixture in the bovines) and possibly also some of the iron metallurgy found among Somalis given that the word for camel among Somalis—and possibly Saho-Afars as well—seems to have an OSA origin and we know our ancestors engaged in a lot of trade with OSA speakers.
They may have also left an autosomal mark that is found homogenously across the Somali genepool like in the case of Habeshas' South-Arabian ancestry. Some on this forum like to argue that the ~10% or so South-Arabian found among Somalis isn't intra-Horn mediated but is in fact from direct Arabian admixture. I think some credence can be lent to that and will go into it in future posts with more detail but again, the point is that whatever mark these people left is not isolated to T-L208 Somalis, whether genetic or cultural.
They clearly left a widespread mark in all Somalis and Northwesterners have simply experienced some sort of founder-effect for the lineage. This really is analogous with pretending J-P58 Amharas are "Semitic" whilst their A-M13 neighbors next door with the same auDNA profile, culture and even IBD sharing with them are "Non-Semitic" Amharas— an obviously absurd suggestion.
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