Originally Posted by
Herr Abubu
It is hair-splitting. Southern Albania was only under Slavic rule for many centuries. Epirus overall was teeming with Slavs, just as it teems with Slavic toponyms to this day. The Albanian language has been influenced extensively by Slavic. A lot of our vocabulary regarding agriculture, the trades, the sea, etc. is Slavic in origin, which is why historians think that Albanians learned and took a lot of these from the Slavs. That in itself is a massive cultural influence, too. That's true whether we speak of Ghegs or Tosks. Then you just have to look at the Albanian Medieval Ages.
I2a's diversity is low exactly because it originated outside of the Balkans and came down to the Balkans with the Slavs, there's the bottleneck. Those same Slavs then brought it down to South Albania. You could hold on to your fantasy that the reason Tosks have a high percentage of it is because of a bottleneck, but there'd be Slav Y-DNA foaming out of that bottleneck all the same. But that's disregarding history. Not to mention the fact that higher I2a in Tosks also coincides with higher R1a.