It's possible to claim
both that the ancestors of I2a-Din were Paleolithic Europeans,
and that its modern spread is primarily the result of much later migrations. Hence why I argue that I2a-Din descends from residents of Paleolithic Europe (I've argued for the
Franco-Iberian Ice Age refuge, although most other authors argue for the Balkans); but at the same time I believe it spread later with the Slavs. I think that's the best guess you get when you traverse the I2 tree. I2a P37.2+
as a whole is very western in its diversity and seems to
have an affinity for the Atlantic Fringe and the Rhine. I2a-Din
itself is in fact a geographic outlier in the I2a family, and STR dating, along with a lack of ancient samples compared to I2a1a M26+, indicates that it only became the most common I2a subclade recently.