this defintley makes sense the indo iranien r1a1a1b2 did not just go striaght from russia to india and iran it first went to Kazakhstan and Siberia then it went to India and iran. Like the tarium mummies they where 4,000 year old indo iraniens in western china near south Siberia with R1a1a probably R1a1a1b2. The Adronovo culture remains they where 3,800 year old Indo Iranians in south Sibera with R1a1a before the Indo Aryans ever went to India.
The Afanasevo, Adronovo, Sintashta where early Indo Iraniens a group probably from central asia or Siberia or even china went down into india and iran. The Sytheins, Cimmermans, Sarmatiens, Tocherians kept traditional Indo Iranian culture and still lived in central asia. the mtDNA, Y DNA, hair color, and eye color of Sytheins and later Indo Iranians perfectly matches 3,800 year old adrnovo people so i know that Sytheins where like 100% Indo Iranien in blood.
What about the I2a1b in Kurdish they are Indo Iranian and have something like 20% I2a1b that must mean there is a eastern european connection maybe because Indo Iraniens and Indo europeans spread from Russia and Ukriane. Maybe there are traces of I2a1b with R1a1a1b2 u know they would not have had 100% R1a1a1b2.
Do u think Balto Slavic languages might be most related to Indo iranien because Balto Slavic is R1a1a1b1 and Indo iranien is R1a1a1b2. I think there is no doubt now that Corded ware culture is proto Balto Slavic two Y DNA remains from them had R1a1a but two dident but u cant expect all to have R1a. Corded ware also existed in south Scandinavia which is probably why Scandinavia has R1a Z284 a brother group to the Slavic and Baltic. Maybe there was a related language to Slavic and Baltic in Scandnavia 4,000-5,000ybp.
But what about Greek, Thracen-Dacen, Aremnian and Illyrian speakers what y DNA did they have did they have any R1a and R1b what pre historic Indo european culture do they come from. The Indo Iranien, Bato Slavic, and Germanic Italo Celtic has basically been figured out but there is still more to learn.