Did you see the charts above at all? Youre obsessed with throwing all i2a into slavic, you can see that dinaric north has greater diversity in albania and greece so it likely travelled with a prior group before slavs moved south
Are you even aware that i2a was born in europe 25,000+ years ago and WHG were i2a? It is the uber european line so who the heck wouldnt be proud of it? Most slavs wish they had it but are stuck with r1a
You're really ignorant about alot I'm afraid. And I say that with no disrespect. Genetics can get confusing with all the subclades, haplotypes, etc. I-Y3120 represents 1 subclade of I2a. The age of I2a being 25k years is irrelevant with regard to the specific lineage we're discussing.
I-Y3120 is a subclade of CTS10228, and has a tmrca of 2200ybp.
It traces back to one man roughly around 200BCE and its most diverse in Polesie. R-L1029 follws a similar scenario and overlaps with the region of Polesie where diversity of I-Y3120 falls just east of its diversity zone. Y1320 is almost entirely found in Slavic people and its Germanic relative upstream formed 1400BCE. This is represented by I-Y81696. Same ancestor dates to a bronze age split before the proto-Celts and Proto-Germanic group. Y3120 together with R-L1029 were nearly entirely incorporated into the Proto-Slavic ethnogenesis before the migration even occurred.
Are there some singleton branches that could be related to atypical cross assimilation of these lines in Goths or Bastarnae?? Perhaps. I wouldn't deny it. The reality is most haplotypes(and that included dinaric north and south together) were bottlenecks and expanded with Slavic tribes.
There was a Y3120 among the Magyar elite who apparently shared a subclade with a Albanian, Bulgarian and Greek. Though this was rare and likely an assimilated Proto-Slav. Steppe tribes were like the Horde in War craft. They mixed and absorbed with everything.
The overwhelming majority of these lines expanded with Slavs. By now there's obviously subclades that were part of the Albanian ethnogenesis like R-Y133367 and R-FT205939 under L1029, and likely subclades under Y3120 specific to Albanians.
However, arguing for Y3120 being more diverse and older in Albanians and Greeks than J2b/E-V13/R1b is false. Most R1a/I2a in Albanians was absorbed in the early medieval, late phase of Proto-Albanian development, somewhere within the Komani Culture. Two waves, one Serbo-Croatian Slavic tribes and the other Bulgaro-Macedonian tribes. R1a in NW is more commonly Z280. Like Serbo-Croatians. R-L1029 is more common in Eastern and South Eastern Albanian R1a, mostly of Bulgaro-Macedonian Slavic tribes.
Denying Slavs played major role in the late phase of Proto-Albanian enthnogenesis is to deny their existence. Proto-Slavs were not only R1a the same way Illyrians were not only J2b-L283.
There's more L1029 in West and NW Europe and even 2 of 3 ancient samples being within the Hallstatt/La Tene sphere. And even then, they're dead end branches and one singleton under L1029. This does not negate its overwhleming majority and later aDNA samples being Slavic.
This includes Y3120.
Heatmaps don't capture diversity. Not entirely. It can just as easily reflect bottlenecks and founder effects. Which is exactly what it is in the South. Older more diverse haplotypes are north east of the Carpathians. And in absolute numbers I-Y3120 is higher in Ukraine.