The Vlach languages show kinship with the Albanian language closer than any other Balkan languages or people. Vlachs most certainly aren't Greeks. It's just Greek propaganda. Same way they claim Arvanite as Greek.
Some of the kinship in Y-DNA with Macedonians and Bulgarians is mostly from assimilation in certain areas. Some of them also show kinship in Y-DNA with Albanians depending on what regions but this could also be due to assimilation i.e some Albanians becoming Vlachs.
Even Romanian language shows a lot of kinship with Albanian. Proto-Romanian must of been very similar to Albanian. I believe Proto-Romanian language is from Thracian and Albanian from Illyrian and that they possibly were mutually intelligible languages and lived next to each other around Macedonia and Kosovo region prior to the Slavic invasions. Proto-Romanians mostly inhabited the Eastern Balkans and Proto-Albanians the Western Balkans.
Most of the living Vlach languages belong to East Latin and so does Romanian and they show a common origin with Romanian. So they possibly came from the East. Genetics mostly show Albanians to be West Balkan people.
Thunmann claimed Vlachs to be Thracians that came from the East Balkans and Albanians as Illyrians, the same thing was claimed by some Byzantium sources:
''I would now like to turn to the actual history of the
Albanians and of the country they inhabit.
They are the descendents of the ancient Illyrians, whereas their neighbours, the Vlachs, whose ancient history I will deal with later, are the children of the Thracians. I will try to prove these statements as best I can.''
http://www.albanianhistory.net/1774_Thunmann/index.html
It's well known that many Vlachs that live in Macedonia, Greece and South Albania came from the Eastern Balkans including some Aromanians. This is how they show kinship in Y-DNA with Bulgarians possibly. Macedonians were just Bulgarians not so long ago and many of them came from Bulgaria and migrated into Macedonia. Some are just local assimilated Albanians.
Kinda ironic considering the Slavs claim Albanians are immigrants in Kosovo and Macedonia when it's obvious the Slavs there are immigrants themselves. And even their so called Native genes don't seem to be from Macedonia or Kosovo in origin for the most part as you said yourself.
But in my opinion, Vlach is just a term for Latinized people of the Balkans.
Some Vlachs in Hercegovina, Montenegro or Dalmatia or Albania are from Latinized Illyrians and not Thracians and should show kinship in Y-DNA with Albanians. Speaking strictly in terms of Y-DNA and going by the ancient samples found in Croatia. But it could have also changed over time from a bottle neck effect of course. They most of also spoken a language similar to Proto-Albanian.
We even have evidence of a Romanized population in Northern Albania and even Montenegro. These people obviously shared more of a common origin with Albos. Some families in these areas even were bilingual and spoke Latin and Albanian.
Though Y-DNA isn't the only kinship, how about over all autosomal or even language ? They would show closer kinship to Albanians in that regard. Both the ones from the East and West.
Both Macedonians and Bulgarians are more Slavic shifted than Albanians.
There are Macedonians and Bulgarians that are as Slavic as Serbs. Same way there are Romanians.
Though many Macedonians, Bulgarians and even Romanians even cluster with Albanians.
Y-DNA is a different ball game, if you look at the over all picture you see that these people are over all closer to Albanians, weather they are Romanized Thracians or Illyrians, and share a common ancient origin and their similarities with some South-Slavs such as Y-DNA and Autosomal is mostly due to heavy assimilation.
There were Latin speakers in Kosovo and in Macedonia but they certainly aren't the same as the ones that live there today that came from more East and are more similar to Romanian, those native latin people in Kosovo mostly fled into Northern Albania and it's those type of Latin speakers that possibly had influence on Albanians as claimed even by some Romanian scholars rather than Romanian directly.
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