The alchemist
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There is a big chance it was a Fertile Crescent type Y-DNA. LN/CA/BA, somewhere west-central, north of Arabia.
It makes sense if we strictly go from these simplified assumptions, working ourselves from down the tree of other clades upward:
T-Y28692 seems like a European Jewish lineage with several assimilates.
Moving upstream, we encounter the Yemeni subclade, T-FTC43481 under T-Y28685 (common parent to the aforementioned European Jewish lineage). Now, there is a mistake in thinking the Jewish European sub goes to Yemen (in terms of geographic origin). Instead, there is a common ancestor, T-Y10641, that contains a diversity of various Arabian (incl. Yemen) haplogroups, listing a European Jewish signature, Egyptian, Iraqi, and Turkey as well. Factoring in the diversified base of T-Y10641, rationally we can assume this is an out-stream point of both T-Y28685 and its under-relations (European Jewish and Yemeni) in an impressively coherent manner, meaning geographic derivative variable. Now the thing with T-Y10641 is it is not the major sub-tree. Above it, there is, T-Y18956, which entails Sardinian (Italian) sibling lineage that has a common parent with T-Y10641 at T-Y18956, then this lineage shares a mutational progenitor with a Scottish individual (T-Z19971*) at T-Z19971. This last one formed at the time of T-Y16897 TMCRA, the parent clade of all.
Already accounting for a sensible heuristic with the constraints, we can infer a geographic spread point somewhere in the Fertile Crescent. What strengthens this further is the rest of the clades on the Y-Full. Namely the Arabian-Somali sibling lineage, T-Y45591, that automatically necessitates an overall geographic picture of centralized migrational accessibility to Arabia, plus, East, West, and North - as we observe the results of.
Then to see the strength of this, one notices that this observation is an apt characterization of the other broader branches within T-L208 showing the same broader tendencies, revealing how all the facts align. Haplogroup T-Z19971 is from somewhere in west-central Fertile Crescent similar to T-L208, but interestingly it seems that it formed in the same broader area until the rest spread from there. The same can be said about T-Y45591, where the overwhelming Somali T haplogroup belongs, but the genesis of TMRCA temporally in 2800 ybp was in Arabia.
This means T-L208 and T-Y16897 had to be somewhere central that could spread into northern Africa, Anatolia, Arabia, and Mesopotamia. The only place for that is to emphasize west-central Fertile Crescent.
The majority of that has to be in Syria.
I conclude my position on this from now on, that where Somali haplogroup T came from before it was in its Arabian context, was Syria. I don't think it has anything to do with Zagros or deep into Mesopotamia (they also got it from the Syrian area, not talking about anything upstream from T-L208). That hypothesis makes absolutely no sense from the evidence we're seeing according to the distributional nature of the clades.
From a time-perspective picture, you had the Neolithic Farmer context in the northern Levant. Then you had the formation of the Arabian-Somali parental clade during the Neolithic-Chalcolithic transition (technically early Copper Age, but some places transitioned earlier) probably in that very same region. When they, exactly, migrated into Arabia is not easy to say between 6800 to 2800 years BP, but it is a big possibility that a considerable part of those 4000 years between was spent in the Syrian region.
Haplogroup T1a1a was found in those Bronze Age Ebla folks, and you had it in Chalcolithic Levant and T1 in PPNB. This is an open and shut case. No more is this a mystery.
The Somali T comes from serious Semitic stock probably related to Eblaite peoples or one of those influential groups in the Syrian region, regardless, essentially a native lineage of that region since the Neolithic and Chalcolithic to Bronze Age. Then they lived in Arabia between 800 to a couple of thousand years (because not sure when T-Y45591 migrated to the Arabian Peninsula between 6800-2800 years BP (guessing 1000-2000 years, maybe due to later so-called BA Collapse?)), and then they came to the promising northern Somali shores some 2000 years ago.
It makes sense if we strictly go from these simplified assumptions, working ourselves from down the tree of other clades upward:
T-Y28692 seems like a European Jewish lineage with several assimilates.
Moving upstream, we encounter the Yemeni subclade, T-FTC43481 under T-Y28685 (common parent to the aforementioned European Jewish lineage). Now, there is a mistake in thinking the Jewish European sub goes to Yemen (in terms of geographic origin). Instead, there is a common ancestor, T-Y10641, that contains a diversity of various Arabian (incl. Yemen) haplogroups, listing a European Jewish signature, Egyptian, Iraqi, and Turkey as well. Factoring in the diversified base of T-Y10641, rationally we can assume this is an out-stream point of both T-Y28685 and its under-relations (European Jewish and Yemeni) in an impressively coherent manner, meaning geographic derivative variable. Now the thing with T-Y10641 is it is not the major sub-tree. Above it, there is, T-Y18956, which entails Sardinian (Italian) sibling lineage that has a common parent with T-Y10641 at T-Y18956, then this lineage shares a mutational progenitor with a Scottish individual (T-Z19971*) at T-Z19971. This last one formed at the time of T-Y16897 TMCRA, the parent clade of all.
Already accounting for a sensible heuristic with the constraints, we can infer a geographic spread point somewhere in the Fertile Crescent. What strengthens this further is the rest of the clades on the Y-Full. Namely the Arabian-Somali sibling lineage, T-Y45591, that automatically necessitates an overall geographic picture of centralized migrational accessibility to Arabia, plus, East, West, and North - as we observe the results of.
Then to see the strength of this, one notices that this observation is an apt characterization of the other broader branches within T-L208 showing the same broader tendencies, revealing how all the facts align. Haplogroup T-Z19971 is from somewhere in west-central Fertile Crescent similar to T-L208, but interestingly it seems that it formed in the same broader area until the rest spread from there. The same can be said about T-Y45591, where the overwhelming Somali T haplogroup belongs, but the genesis of TMRCA temporally in 2800 ybp was in Arabia.
This means T-L208 and T-Y16897 had to be somewhere central that could spread into northern Africa, Anatolia, Arabia, and Mesopotamia. The only place for that is to emphasize west-central Fertile Crescent.
The majority of that has to be in Syria.
I conclude my position on this from now on, that where Somali haplogroup T came from before it was in its Arabian context, was Syria. I don't think it has anything to do with Zagros or deep into Mesopotamia (they also got it from the Syrian area, not talking about anything upstream from T-L208). That hypothesis makes absolutely no sense from the evidence we're seeing according to the distributional nature of the clades.
From a time-perspective picture, you had the Neolithic Farmer context in the northern Levant. Then you had the formation of the Arabian-Somali parental clade during the Neolithic-Chalcolithic transition (technically early Copper Age, but some places transitioned earlier) probably in that very same region. When they, exactly, migrated into Arabia is not easy to say between 6800 to 2800 years BP, but it is a big possibility that a considerable part of those 4000 years between was spent in the Syrian region.
Haplogroup T1a1a was found in those Bronze Age Ebla folks, and you had it in Chalcolithic Levant and T1 in PPNB. This is an open and shut case. No more is this a mystery.
The Somali T comes from serious Semitic stock probably related to Eblaite peoples or one of those influential groups in the Syrian region, regardless, essentially a native lineage of that region since the Neolithic and Chalcolithic to Bronze Age. Then they lived in Arabia between 800 to a couple of thousand years (because not sure when T-Y45591 migrated to the Arabian Peninsula between 6800-2800 years BP (guessing 1000-2000 years, maybe due to later so-called BA Collapse?)), and then they came to the promising northern Somali shores some 2000 years ago.
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I only meant for Somali history back beyond Arabia to the Neolithic, Copper Age, and Bronze Age which was mainly in modern geographic Syria.
Then, crossed the Bab El Mandeb thereafter. 
You can't see them through rose-tinted glasses only.
