Take the following post with a grain of salt, as I know this is a sensitive topic, just giving some thoughts/ideas for a discussion. Albanian has links to Illyrian, Thracian, many Latin loans, some non-IE words, etc, and combined with the fact we barely have material of the ancient Balkan languages, it's extremely difficult to tie it to just one language. Despite having links to Illyrian, and Thracian, and Dardanian, etc, they aren't enough to be conclusive. (According to today's linguists studying the Albanian language)
Maybe the Albanian language comes from a combination of ancient people, of the last surviving Illyrian tribes and the last surviving Dardanians, who found refuge in the mountains of Northern Albania, Montenegro, Kosova, following the Plague of Justinian & Slavic Invasions. During a time where a disease is causing widespread sickness, death, lack of food, heavy migrations, social and political instability, I think it would have been natural for the last fleeing ancient Balkan tribes to be aware that they aren't "barbarians" like the new invaders, and settle with native people who are like them. For example, a fleeing Thracian assimilating into a group of Illyrians, or Illyrian assimilating into Thracian, or a Romanized Balkan person, assimilating into Non Roman or Semi Romanized people, etc, you get the point.
An Illyrian + Dardanian combo would fit nicely with aDNA too, since the ancient West Balkans seemed to be heavy in J2b, with some R1b, and the Eastern Balkans, more heavy in E-V13, with some R1b and J2b2 (Although the samples from East Serbia, were after antiquity, around 400CE, and not from the core of Dardania, but slightly north east of its borders). We do need more samples from the Southern Balkans overall, to see if this genetic trend continued North-to-South, or if the Southern Balkans had more of a mixed bag of haplogroups (E+J+R)
Possible "layers" of the Albanian language:
-Illyrians from Illyria Proper (North-Central Albania, Montenegro, parts of Croatia and Herzegovina)
~Romanized Illyrians,
~Non-Romanized Illyrians, living in the mountains, avoiding Roman society in the lowlands
-Dardanians
~Romanized Dardanians,
~Non-Romanized Dardanian Rebels
-Important to note for Dardania:
~Was a Thracian tribe early on (Pre Roman)
~Became ruled by Illyrians later on (Pre Roman)
~Received more Daco-Thracian influence during Roman/Byzantine Era? From the ancestors of those who would later become Vlachs/Romanians?
Extra possible influences:
~Brygians (Thracians who went into Dardania, Paeonia, today's Albania, around 1200BC. Shortly after, into Anatolia. Did some stay behind? Did they impose their language in Albania? Or were they assimilated?)
~Paeonians (Illyrian/Thracian) (Stone tablet found by archeologists, reads of a person hailing from Albanopolis, Albanoi tribe in North Central Albania, 300BC or AD, can't recall) (Cities of Shkupi, Shtip, Sharr, proven to have developed from Albanian language, possibly from Dardanians/Paeonians)
~Triballi/Mysians (Celtic/Thracian/Illyrians?) (Resided around East Serbia, just outside of Dardania, where Proto-Albanian and Proto-Romanian contact might have taken place)