There is also a total lack of EV-13 among Illyrian samples so far. Southern Albania was settled by various people through different waves. Except for the dialect split there were also Vlach and later Gheg migrations. Your comparison of J2b2 with EV-13 to southern Albania to me makes no sense. Also J2b2 which is a strong Illyrian marker so far does not even seem to peak in Central Albania neither in Tirana nor any close areas rrenjet.com/statistikat/
J2b2-L283 actually peaks in the Malsi / Kosovo . Of course it could be a bottle neck like anything else.
Reality is that we don't really know where Proto-Albanians originated for certain , we only know the name comes from a tribe in Albania . And the people that live there today have a strong affinity to EV-13 and some other markers it seems, they cluster more Greek-like but this is not the case for all Albanians, some almost cluster like Sicilians if you go more south and some more North Italian, Tuscan etc.... but there is none so far that clusters West like those samples in Croatia so there obviously was a Eastern shift in the South Balkans at least. We have hundreds of years before the Roman period and the end of Classical Greece. And then we have hundreds of years of the Roman period. Anything could of changed and also changed. Right before the Roman occupation many of the areas in Northern Albania, Montenegro etc were actually occupied by the same or related tribes that became power bases before Roman conquest. This might not of always been the case. Dwelling into some autosomal clustering seems meaningless.
Of course, there is also the question of Slavic influence.
J2b2-L283 actually peaks in the Malsi / Kosovo . Of course it could be a bottle neck like anything else.
Reality is that we don't really know where Proto-Albanians originated for certain , we only know the name comes from a tribe in Albania . And the people that live there today have a strong affinity to EV-13 and some other markers it seems, they cluster more Greek-like but this is not the case for all Albanians, some almost cluster like Sicilians if you go more south and some more North Italian, Tuscan etc.... but there is none so far that clusters West like those samples in Croatia so there obviously was a Eastern shift in the South Balkans at least. We have hundreds of years before the Roman period and the end of Classical Greece. And then we have hundreds of years of the Roman period. Anything could of changed and also changed. Right before the Roman occupation many of the areas in Northern Albania, Montenegro etc were actually occupied by the same or related tribes that became power bases before Roman conquest. This might not of always been the case. Dwelling into some autosomal clustering seems meaningless.
Of course, there is also the question of Slavic influence.