By the way, I found an explanation for the low level of Slovenian and West Croatian E-V13, plus additional evidence for the Gava and Basarabi-Eastern Hallstatt theory on the spread of E-V13. Because I know that the majority of the samples from Slovenia in the Iron Age can't be all Celtic, even after they came in. I looked at the local archaeological culture and its burial rite and social organisation, and its linked to Dalmatia, Southern Bosnia and Macedonia, its Illyrian derived!
The groups to the North, out of which after the fusion with Celts the Norics came about have on the other hand much more intensive contacts to Basarabi, especially their elite, like exemplified in Fr�g, which is much more Northern and Western. Actually, even the Venethi people are supposed to have been much more influenced by Eastern Hallstatt-Basarabi, than the "Hallstatt group" of Krain!
https://www.zobodat.at/pdf/Rudolfinum_2002_0035-0064.pdf
That's actually the last nail to the coffin of Illyrians being the original spreaders. Illyrians were largely Tumulus-culture remnants which moved South and mixed with locals. Eastern Hallstatt shows multiple influences, including Illyrian-related and Thraco-Cimmerian.
The frequency of E-V13 even in regions like Slovenia, Croatia, Austria and Czechia dates back to the LBA and EIA, to the expansion of Southern Urnfield and Eastern Hallstatt respectively for the most part. Even the later Scythian influences on Hallstatt and the Celts were largely transmitted by Geto-Scythians which were majority wise Daco-Thracian, related to what developed out of Basarabi under Scythian influence.
If the upcoming paper proves that the Slovenian Hallstatt province had little to no E-V13, that's key. Because the pre-Celtic, Celtic and Roman Noric people will have it, and it will be there up to Moravia and Bohemia. The find of LIB11 was not by chance and more will follow.
Oh, and Greeks might have indeed played a role in Dalmatia, because Greek and Greco-Roman settlements, as well as later resettlements and refugees from the Slavs influenced the Dalmatian islands the most! This might explain why the Illyrian mainland has so little E-V13, whereas the islands might harbour more. So Greeks could have played a role, as well as other Balkan resettlements. But this needs to be investigated with the local Dalmatian islands subclades, of which I have little knowledge.