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It's always difficult to draw conclusions from analyses based only on modern frequencies. Here, I'm particularly unsure of the history of the spread of Q in Europe. I haven't read any attempts to separate it into subclades, date it, or find diversity hotspots. If anyone knows of such an analysis, it could help us here tremendously.
I see some correlation between I2a-Din and R1a, with some caveats. For one, several R1a subclades had already spread out (in the late Neolithic, think Corded Ware) to Central Europe before I2a-Din began, so it's only some R1a that I2a-Din correlates with. Also, it's fairly clear that where I2a-Din and R1a spread together, I2a-Din was the dominant partner in Southern routes, and R1a was the dominant partner in Northern routes. I continue to find that pattern consistent with the Slavs. As for Q... I wish there were more Q experts around.