So how can all these J2b2-L283 branches come from Bulgaria when they are found in Western Balkans ?
I was speaking in general and explained in the previous comment. I mentioned J2 in the context of Bulgaria and etc. In context of Bulgaria is
J2b-M205. I also used the historical context(Vlach migration) because we do not live in time when genetics has 100% shown that something is correct and final. In this context I also mentioned Albania and etc.
These samples are quite a good match for Albanians.
Probably yes, I did not dispute that.
Can you show us this Bulgarian connection please ? How are the major EV-13 Albanian branches supposedly linked to Bulgarians ?
If archaeogenetic data show that E1b V13 branches are not exactly(in large numbers) in the proto-illyrian area(western Balkans) and time, then at this moment we would have to use living genetics and the epicenter of E1b V13 in the Balkans, which is the area of Kosovo. Also we use and YFull in which a possible connection with Bulgaria is visible (in some common ancestral or brother mutations). If we use this for some conclusion then conclusion is that E1b V13 peoples in Illyrian time or early Illyrian time live somewhere further east. Where exactly I don't know, but possibly around Kosovo or towards Bulgaria or hilly Albania. But Illyria is also here. It is possible that there were separate groups in early Illyrian time, towards Croatia one group, towards Albania and Bulgaria other group, etc. I am expressing my opinion, which is open to criticism.
Maybe linked to the Bulgarian Empire ?
Maybe it's about time of Bulgarian Empire but then the genetic links would be stronger, even linguistic ones, etc. It is possible that it is some older connection ie Thracians etc. I don't know the history of that area so I can't claim.
Indeed, by Y-DNA South Slavs don't seem very much mixed with Illyrian due to a huge founder effect of I2a1b/R1a
I think that west Illyrian population fled to the east and may have merged with E1b V13 peoples at that same time. There is also that option. But a new scientific paper says that the Slavs partly assimilated the Illyrians, so the matter is unclear.
If we use Slovenian genetics, which is the purest in terms of migrations in the Turkish era, I don't know how much Balkan genetics would show up in Slovenians. A couple of percentages, that's too little to conclude that the Slavs assimilated the Illyrians or a good part of the Illyrians ie Balkan population.