PonticCaspian, a participant represented in the main graph above, with Moldavian Gagauz and some Ossetian ancestry presents much the same pattern except with higher WMPC (possibly due to proximity to Balkan/West Caucasus populations). Much of the same pattern can be observed in Altaians and Buryats, in a much smaller FC element.
I really don't see population changes after the initial invention/introduction of advanced pastoralism producing such an homogeneous pattern (bear in mind some of these are small components, indeed all of these in the Mongolian case are small, since they're mostly an Eastern population and can be overinflated by the exclusion of major "Siberian" ancestry). Certainly not from Mongolia to the far west. These patterns I think most likely roughly correspond to the original Kurgan pastoralist people, and possibly also to the ancient Tocharian peoples.
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