ToBeOrNotToBe
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An insightful post, in my opinion.
One objection, though : the "wiping out" does seem to have occurred - at least in the geographic pockets where the Reich study under discussion here was conducted. Otherwise I don't think a reputable lab would go so far as to mention it.
This said, I agree that :
- what is referred to as "Yamna" should probably be more cautiously labelled "broadly steppe " (to use 23andMe terminology).
- the influx of R1b into Iberia occurred in distinct stages. Lusitanian was a Kw- language (Iccona [ikwona], the horse goddess, later Epona in Gaulish ; also Equeunubo - dual number -, the horse-riding twin gods). Celtiberian was an "in-between" language, with Gw > b, an early proto-Celtic shift, (boustom, from *gwousth2o, cow shed), but Kw = Kw (ekualaku [ekwalakwe], horses +'element unknown' + kwe)
I would agree the later waves were densely admixed when they finally got to Iberia, but depending on the study, the first migrants were pretty much steppe-like. It probably didn't take 70 generations for them to come from the steppe, even accounting for a stop in central Europe. Or if it did, they must have retained a high degree of endogamy. R1b penetration into Bell Beaker territory seems to have been quick-paced. They were probably few in numbers, though, hence the tenuous autosomal impact. I am not sure the earliest settlers were even DF27 yet. Time will tell.
Almost all historical linguists see the spread of Celtic as originating in the Hallstatt culture, which was much later. As for Lusitanian - it's a bit of a mystery, but most that have an opinion see it as being Italic. Moreover, there is no evidence of IE languages in Britain before the Celts.
I repeat my previous claim - Indo-European languages in Western Europe are EXCLUSIVE to two ultimate sources - U152 and U106. These are the ONLY L51 subclades to have developed in Central Europe - right in Corded Ware territory (and this is not a coincidence, as I would be willing to bet that Corded Ware is ultimately the vector to which Western IE spread from). This is also consistent with a non-IE origin of L51. By no means conclusive, but it makes sense (as to why IE hadn't spread out of Central Europe even while Bell Beaker folk had invaded all of Western Europe and were participating in the Atlantic Bronze Age).