My only explanation for that; is what I stated above. I believe that Slavs may very well be related or relative to Thracians or Dacians.Both modern and ancient dna and linguistics strongly suggest that the Slavs are the late comers to the Balkans. Of course, modern south Slavs have ancestry from the Neolithic migrations, the Copper Age and Bronze Age migrations, and the Slavic migrations. Each ethnic group just has different percentages of those ancient, now extinct populations.
And if I am right about Illyrians being merely a federation of Celts put on a map (just like Gauls) and not a distinct tribe of it's own culture/tongue; then that means many of these Illyrian supposed "Celts" migrated out of the Balkans to the North and/or West. That would leave the door open for Slavs to later migrate (or "invade", which I doubt) into former Illyria. But this here could possibly be an explanation for why Dinaric I2 is more recent/young. (it may have nothing to do with Slavic invasion.)
Edit: in other words, whomever this Illyrians were (if not Albanians or even Slavs or Thracians) - I am basically saying that before 5 or 6 AD; they obviously left the Balkans. I could see no other place to migrate but Northern and/or Western. My belief right now, is that Illyrians may have been a distinct Celtic tribe of some sort.
See here: https://en.wikipedia.org/wiki/Illyrians#Illyrians_in_Greek_mythology
Also, notice the image to the right:
https://upload.wikimedia.org/wikipe...a_Family_Tree_(Greek_Mythology)_(English).jpg
Where the Greeks mythologically seem to suggest that these "Illyrians" have more in common with Celts.
Also, https://en.wikipedia.org/wiki/Illyrian_languages#Celtic
It seems to me that the name borrowings in Illyrian are more plentiful in Celtic than in Greek or even Thracian. This is particularly interesting; and raises the question of why Albanians lost a substantial amount of Celtic influence (to me); if they are indeed descendants of Illyrians. Makes no sense to me.
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