@Kelmendasi
You write, "Nope it doesn't, by this logic it should've expanded also from Albania. CTS1273* has shown up in the Balkans, the result I'm referring to is my maternal uncle, they are from the Dibra-Librazhd area. Not every CTS1273* sample has been uploaded to Yfull.".
I can only evaluate what i see uploaded. Even if there is actually a CTS1273* that is found in the Dibra-Librazhd area, i would very much like to see it. In any case though, it still doesn't negate its proto-Greek connection, it only corroborates it. It could very well be a palaeo-Balkan IE line out of which proto-Greek sprang. You also have to consider that in fact, the widespread proto-Greek region is very close to the Librazhd area.
As for the other point, the thing is that the logic of hailing from northern Caucasus is actually based on the prevalent hypothesis that proto-Greek expanded from Catacomb. And in general, most if not all IE groups likewise. We don't know of any similar expansion toward northern Caucasus from the Balkans during 2500 BCE.
You write, "The Jewish sample isn't Ashkenazi iirc, he is from Turkey, but it's highly likely that his paternal side came from Europe. Y-DNA has shown that the Khazars have nothing to do with modern day Ashkenazis.".
In the thread i am referring to, @Aspurg writes that id:ERS1789480 is from an Askhenazi individual.
Furthermore, the origin of Askhenazi Jews is a whole topic of its own, but there have been hypotheses that place their origin on the eastern Pontic mountains (very close to Pontic Greeks in fact) of Turkey as well as southern Europe, in addition to Levantine origins of course. In any case, it is known that Khazars had embraced the Jewish religion, therefore it's not that unreasonable to consider that some might have migrated and joined the Ashkenazim of Eastern Europe once their Khaganate had fallen.
You write, "The fact that CTS1273 has little to no diversity in the Caucasus or surrounding areas make it extremely unlikely for it to have origin there, the most likely scenario is that CTS1273 originated in the Balkans but a branch migrated to the Eastern European steppe area, where it was assimilated.".
This isn't corroborated at all archaeologically or linguistically, other than genetics the evidence shows quite the opposite rather. The fact that it is also widespread throughout Europe, points to the migrations of Indo-Europeans that began from northern Caucasus or the Pontic-Caspian steppe.
You write, "Y30977 does have pretty clear origin in the Balkans. It's most diverse in the Western Balkans, most frequent in the Balkans and it's basal clades show up most in the Balkans as well. Unlike, CTS1273, Y30977 doesn't seem to have been picked up by IE speakers, it remained in the Balkans for longer.".
I don't see any E-Y30977* sample, therefore i don't know how you come to such a conclusion. You are obviously referring to its daughter clade E-Y37092*, which has been found in Greece and Montenegro. It would be nice to know the background of the American E-Y30976* (which is the sister clade of E-Y37092), since E-Y30976 seems to have an Eastern European/Caucasian distribution, and it formed likewise 4100 ybp.
You write, "You need to specify which clades you're referring to, the BY3880 guy is actually Z5018* it's just that his analysis hasn't finished. Z5018 has a TMRCA of ~3,700ybp and seems to be most diverse in areas north of Greece. As for Y37092, this branch remained in the Western Balkans so it's possible that Proto-Greeks picked it up when they arrived in the Balkans.".
I am referring to E-BY3880*, which is present in an Italian of most likely Greek origin. Again, we don't have a E-Y30977* sample to be certain about E-Y37092*'s original regional source, but it does look to have a Pontic-Caspian IE source when you also consider the distribution of the related E-Y30976.