How did I2a-Din get to the Balkans?
An I2a1b carrying IE proto-slav speaker had great genetic success 1800-2000 years ago. I2a is native European to the Mesolithic but that does not mean the males who carried I2a1b to success were Mesolithic survivors. I believe it is highly likely they were a tribe lead by a man who found himself born amongst whatever of the various IE proto-slavs. He was probably an important leader with many sons. The TMRCA is too similar to equally successful R1a clades involved in the same epochs:
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Czechs R1a belongs in majority to M458, with subclades such as L1029>YP1703 (TMRCA 1800 years), L260>YP256>YP654 (TMRCA 2200 years), L260>YP256>YP254>Y2905 (TMRCA 1850 years) and L260>YP1337 (TMRCA 1750 years). Other R1a clades found in the Czech Republic include Z280>Y35>CTS3402>YP237>YP951 (TMRCA 2500 years) CTS1211>Y35>YP4278 (TMRCA 1850 years), some Z92 and Z93, as well as the Germanic L664 (S3479>S3485>S3477>YP942; TMRCA 1800 years). The age of these subclades concord with the historical Slavic expansion during the Late Antiquity and Early Middle Ages.