Ygorcs
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Even considering BB the original carriers of IE (6th option), that would justify the spread of Celtic, Italic, Germanic and even
Balto-Slavic, and Balkanic languages (from Hungary), they might be capable to change language to former CWC people but in eastern areas, much less colonized, the autosomal would be more diluted, and even local R1a Y-DNA would be integrated, which ultimately would expand eastwards providing Indo-Iranic and Tocharian by 2000 BC in the steppes... sounds like writting a major heresy, but now, with the data on hand, one can expose even this case.
Your point about Tocharian is based in an assumption not demonstrated: that Afanasievo are linked to Tocharians (different Y-DNA profiles, 3 millenia diffrence and 2000 km distance). Also it's an assumption to link IE to Yamna.
Irrespective of the culture that gave origin to Tocharian, or where PIE was first spoken and spread from, it is certain that steppe-related ancestry, with EHG signal, spread significantly during the early and middle Bronze Age in Central Asia, but not much before. Also, it would be necessary to find a Neolithic (assuming that the expansion you hypothesize is a Neolithic spread of pastoralism, as you said) archaeological link that can indicate a spread of a particular culture from the northern Fertile Crescent to the vicinity of the Altai mountains. Is there such a culture? It's not enough to simply dismiss the current hypothesis, it's necessary to substantiate the new one and, additionally, explain the details of the expansion and not just the place of origin.
It also certain that, wherever Proto-Tocharian was spoken, it split from the rest of the IE languages very early, probably before 3000 BC (I think most linguists assume a date around 3200-3500 BC). So, I think that sets a "latest" possible date for the dispersal and differentiation of IE languages even excluding the most archaic and controversial branch, Anatolian. PIE was most certainly spoken, in undivided form, before 3500 BC and, including Antolian, very probably before 4000 BC. And if they came from the Near East as early as the Neolithic it's necessary to find a common genetic sign of that expansion right from the Near East to both Western Europe and the Tarim Basin. Otherwise, we'll just be coming back to the "steppe as a vehicle" hypothesis, that is, Pre-PIE coming from Transcaucasia or Anatolia but developing and splitting into different languages in the steppes, possibly with the exception of Anatolian.