No,no,no, I understand very well, what you say. But it is a fabrication.
IJ may have migrate through the East Europe, specially if they are cromagnons who are believed to have defeated Neandertals. So they did't migrate through Balkan, but through Ukraine.
Even if they migrate through Balkan, that doesnt mean that I2a2 was created here.
The frequency of mutations is the beiggest in Ukraine-Moldavia. In another thread, I sent you a book, which is the last study, on which is based and Prengu when said that it came from Ukraine, or Rumania.
I2a2 after the last study is only 3.000 years old, so it mast have been created somewhere exist the haplogroup I, and not in the Balkan were I is comprised exclusively of I2a2 and it is an OASE among J2 and E-V13. "A black sheep among whites".
That means somewhere in the 1.000 BC was bornt the first man with I2a2 Y chromosome, and it was somewhere in Moldavia.
I distribution show clear rout to south. REMEMBER before the Indo-European invasion, in Scandinavia I haplogroup was 100%, and not like is today.
Also you have I2a in Russia, which mutated to I2a2, and then during Slavic invasion, I2a2 came in the Balkan together with Slavs.