I don't really understand the question tbh because so far it's been quite obvious that our lineage is of Arabian origin, although not necessarily Arab. The more samples we'll get, the more precise we will be able to determine when our ancestor arrived in the Horn or at least split from his Arabian tribesmen. I'm quite surprised at how low the TMRCA got rn. Even the Isaaq TMRCA (which was pushed to 950ybp when I uploaded my kit) got reduced to 750ybp. Thats insane.
The tree in march 2020
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The tree in June 2020 (my kit was added)
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The current tree (an Alma3y individual's kit was added)
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This just shows how nothing is set in stone and that everything can be interpreted differently. I think we all used to agree back then to say that T in Somalis was ancient, then we were kind of forced to admit it's actually not that old at all, and now we have clear evidences it is very young. Some clans in Somalia might be even older than the Isaaq/Dir split, or even T-Somalis/Arabian split. Crazy stuff