>well if you are going to go back this much as far as Y-DNA R*, sure, but then you lose the cultural aspect of things
Well, language and religion seem to be the most important factors defining culture and the R1 people are characterized by these two things culturally.
>I was referring to the overwhelmingly R1b bearing Yamnaya peoples(see pic related), the ones who actually spread IE culture west, as testified by the huge presence of R1b compared to R1a, which seems to be a more eastern branch.
R1b and R1a had the same origin, they are just separated in time. Think of them as two waves of migration. R1b was the first expansion of these Indo-Aryans into Europe (hence their prevalence in the West) and R1a was a more recent stage of the invasion (probably Corded Ware).
I like to think of R1b generally as the "Celts" and the R1a people as the Germans and proto-Slavs.
I'm not sure if blondism was present in R1b as it is obviously in R1a, but does it matter? That's just one gene failing to operate correctly because it was selected for.
>Every single European got enriched by the Aryans, point is that by the time of early Rome, they would've already mixed, they were already "Italic" in race i.e that particular mix of aryan related ancestry and neolithic ancestry
That sounds plausible since the late R1bs arrived in the late Neolithic. So the Italic type was already firmly established.
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Oh, also, don't forget that the "aryans" carried almost half of their ancestry from the caucasus, a population highly related to neolithic Iran. This if you want to go back that much.
I suspect presence of this type in Iran and Pakistan is due to back-flow of genes due to environmental reasons or conquest.