The little I2a2a (old I2b1) found in Asia so far, which has been SNP tested, has actually been of two different varieties: I2a2a-Cont3 and I2a2a-Roots. I don't think we can say which, for sure, has been found in Afghanistan. Undoubtedly, the I2a2a-Roots which has been tested so far has had a center of diversity in Central Europe, and spread mostly in Germanic areas (although, as always, I admit that this may change as more samples come in). But I2a2a-Cont3 has its apparent center of diversity in Eastern Europe, or at least on the Eastern edge of Central Europe. I've never really felt Cont3 to be particularly "Germanic." So I think there's still a lot left to be studied here.