Albanians seem closer to Greeks than to Albanians from Kosovo. I think that Albanians will be even more closer to Greeks if the Ghegs from Northern Albania and the Tosks south of the Drin riven (Greek historical cultural sphere) will be categorized seperately.
The tosks are probably descendants of Greeks or of tribes who did not call themselves Greeks, but did share common decent with them in pre-history. Probably both could apply.
It also makes sense based on what albanologist Dr. Kaplan Resuli had to say about Albanians: - When Albania is proclaimed and recognised as an independent nation (1912-1913) its population numbered 700,000 of which hardly 50% were Albanians, while the other half was made up of Vlachs (around 20%), “Slavs” (Macedonians, Serbs, Montenegrins, around 15%),Greeks (around5%) and others (Turks, Roms, Cherkesians, Italians, Jews and others, around 10%). With the passing of time, mostly by force, with denial of all national rights, including the right to speak in their own languages at home, or to carry their own national family names, they are to a certain extent assimilated. But, even besides the such forced albanisation, in Albania even today over 30% of the population speaks a non albanian language and retains its non albanian national identity, although they are registered as Albanians, as they are not permitted to declare differently. The non albanian origins of the population of Albania is also evident from their surnames Bello, Blushi, Bogdani, Buda, Budi, Dida, Dobraci, Dragovoja, Dragusha, Haveri(ch), Kapisuzi(ch), Mexi, Millani, Milloshi, Mojsiu, Muzaka, Najdeni, Peku, Prela, Ruka, Sillil, Shkura, Shundi, Ziu and many others.
So the first point to make is that the ancestors of the Albanians were very few in numbers only a century ago. Just 700.000 of which half of them were actually not Albanians. North of the Drin river there were 15% of South Slavs (more I1 and I2b) and South of the Drin river there were at least 25% Vlachs and Greeks. The Vlachs are probably very close to the Greeks and the rest of Southern Albanians genetically because they are Latinised indigenous Balkanian tribes who historically were either Greek or related to the Greeks.