Attempted mapping of I2c1 and I2c2 to Mesolithic, Neolithic, and Bronze age cultures:
I2c1 : Tardenoisian --> LBK --> Bell Beaker --> Unetice --> Tumulus --> Urnfield --> Hallstatt --> La Tene; I2c1 spread further with the alpine Celts (R1b-U152).
I2c2 : Kongemose --> Ertebølle --> Funnelbeaker --> Corded Ware --> Catacomb --> Trialeti
I2c2 is mainly found in Armenians, every deep subclade(BY181+ and BY181-) of I2c2 includes Armenians and they score the highest national level if I2c2(4%), in this scenario it is then associated with R1b-L584(60% of R1b in Armenia) and hypothetically, the Trialeti culture. a TMRCA of 4000 years dates to the start of Trialeti.
I2c2 in Georgians must have an Indo-European origin, in the same sense R1b-L584 in Georgians has. In Europe, I2c2 matches the territory of the Alan migrations, who must have carried it from Armenia during their raid in the first century ("So the Alans, being still more provoked by this sight, laid waste the country, and
drove a great multitude of the men, and a great quantity of the other prey they had gotten out of both kingdoms, along with them, and then retreated back to their own country.")
https://en.wikipedia.org/wiki/Alans#Early_Alans
R1b-L584 in Europe has a similar distribution.
The above scenario explains how I2c2 was found in mesolithic Sweden, and it's modern distribution in the Caucasus, a separate I2c2 lineage (?) is found in Unetice, but given how Caucasians fall under all subclades, I hypothesise that individual wasn't the ancestor of modesrn descendants, and that his line is extinct.
Catacomb culture is theorised to be the ancestor of Armenian, Greek, and Albanian languages. The origin of the Catacomb culture is disputed. Jan Lichardus enumerates three possibilities: a local development departing from the previous Yamna Culture only, a migration from Central Europe, or an oriental origin. If our model is correct, the answer is central Europe.