The Armenian case and you would favour a neolithic Anatolian expansion for M269, being dominated by G2a males otherwise.
...humm. Dont know if I get your coment correctly. Anyways what I figure so far:
a. ~8000BC, as the Barcin (G2a) males spread agriculture, they avoid first Thrace and balkans. Why? - because that was the land of "different people".
b. That Thrace up to Iron gates was full of R1b males. I think some of those mainly pastoral people were already M269 when they moved INTO Anatolia. Anatolia was devided by a forest north/south. So, Barcin south, and these guys higly pastoral (more than farmers) moving by south Black sea cost into South caucasus by 6000BC were also great farmers also by that time. They have a trademark: Spelt , which they brought from Vinca land. Follow spelt from that point on and you are following that people.
c. When forming Shulaveri-Shomu (6200bc), in Georgia, at the Kura river, they were very different from the surrounding. just some resemblance to Halaf. That Kura river basin was a great place to be left alone. They mingled with some CHG people. they had a 1000 years to look into Caucasus mountains (especially near black sea).
d. When something bad happened (they completely vanished by 4900BC). settlement burned, most never occupied by nobody, not even Sioni, they new wher to run. Kuban river, and into steppe. some back to Kumtepe (Kum6) and on back to Balkans. Those back to balkans should really be L23 (xAnything else),