All this talk about north to south "conquests" in the LBA and IA but somehow we're finding pure Germanics/NW Europeans (Hacs10, Hacs22, Anderten) from the migration period with an Iron Age southeast European lineage (
J-Z1043). Strange..
I'm sure there's some fantastical convoluted scenario that could explain this, maybe the northern conquerors abducted a poor Balkan child who then had a secret love affair with the German chieftain's wife
You mixing up periods and contexts. Highly important is that the later Eastern Germanics were already Christians, oftentimes with a king. Those people were, usually, much more tolerant and less tribalistic, rather tried to exploit other people than annihilate them. It is known, even from the written records, that the Germanic tribes or nations had allies, servants and hostages among them and we also know from the place name research, that in the Germanic areas pre-Germanic survival was way higher than in the Slavic zone. E.g. there is a sharp borderline in areas of Austria between the heavily Slavic areas and the Bavarian one. In the Bavarian we get a higher frequency of Roman and Celtic place names, whereas in the Slavic zone are whole regions with practically no place name survival from Pre-Slavic periods. That speaks for itself.
The further back you go, the more tribalistic a people was, the less lenient they were with the conquered, especially the conquered males. We get multiple mass burials in the Neolithic and Bronze Age which attest to that.
As for the situation in Greece, we can now say for sure that E-V13 was introduced by Daco-Thracian people associated with first Channelled Ware and then Stamped Pottery. Both made their visit to Greece and influenced it, especially the former, but those Urnfield-associated groups were pushed back by local people apparently. This is something which was already noted from the archaeological context.
The Mycenaean Greeks don't look like having any significant amount of E-V13 at all, while by the Iron Age we know that the post-Psenichevo (late Stamped Pottery sphere) people from Thrace had a lots of E-V13.
The question therefore is was E-V13 spread by pre-Psenichevo Urnfield-/Gáva-associated Channelled Ware groups, and if it was, how much of an impact did they have genetically on the Northern Greeks in particular. Again from the archaeological point of view, their entrance and impact on Greece is not debatable, its there. But since we haven't any of these Belegis II-Gáva-related groups sampled yet, we don't know for sure whether they were dominated by E-V13 (what else one may ask considering their impact which can't have been low in the Balkans).
There were distinct cemeteries of related people in Greece, but while the local population adopted customs from them, the distinct settlements and cemeteries did disappear, which can either mean, that they left, being annihilated or were assimilated.
Therefore there are the following hypothesis to prove:
- E-V13 was spread by Channelled Ware cultures in the Balkans. At least secondary centres were primarily in North Eastern Serbia and Southern Romania and North Western Bulgaria in the LBA, from where they spread South. Whether the primary source was the Upper Tisza is yet another hypothesis which needs to be tested.
- Those Channelled Ware people moved into Greece (archaeologically attested) and might or might not have had a genetic impact on the local population. This needs to be tested too, in the regions which were affected. The problem here is that especially those affected regions did, like many Daco-Thracians, oftentimes cremate their dead. But going by the currently available results, it doesn't look like those Eastern Urnfield related groups had a significant impact on the Greeks and most of the E-V13 came in later, due to Thracian contacts.
I posted back on AG a lot of papers dealing with the Morava-Vardar migration deep into Greece. That's, to make that absolutely clear, not debatable. The question is just whether these archaeologically attested people were E-V13 and what impact they had genetically. That's a different question than whether or not a migration/invasion took place, which is a just a reality.