Of course they came from the BMAC, but a few centuries earlier they came from Sintashta. That's proven. R1a-Z93* was found in EBA Russia. Deal with it.
Huh? Do you have any evidence that Sintashta folks migrated into BMAC? BMAC culture is actually
OLDER than and pre-date Sintashta, like Maykop is older than and pre-date Yamnaya. Actually, they have found BMAC influences in the Andronovo Horizon.
BMAC = 2300 BCE ,
AT LEAST
Sintashta = 2100 BCE
They found also J1 in pre-Neolithic Karelia, that doesn't mean that J1 is from Finland..
That R1a-Z93* in EBA Russia was an invader from the Iranian Plateau who brought Gedrosia auDNA into the Steppes. How do you think there is so much Gedrosia auDNA in the ancient Steppe samples? Exactly, that R1a-Z93* was NATIVe to the Iranian Plateau and therefore to the BMAC culture. Has NOTHIGN to do with the Steppes at the first place.
+ there is almost no ancient Y-DNA N & Q in Northern India (some of it is from late Turkic tribes), so there was no migration from the Steppes into the BMAC.
You have to deal it.
You said first that Indo-Iranians went directly to India from Sintashta by AIRPLANES. I truly don't know what your sources are. No LOGOS at all.
Aryans that invaded India were from
BMAC and NOT Sintashta/Steppes. FACT! BMAC was an Eastern Iranian culture full of Iranian Plateau auDNA! FACT! Aryans that invaded India from BMAC were mostly Iranian Plateau folks. CHECK!
And it is in agreement with nowadays findings. Modern Iranian & Indian people have still a lot Iranian Plateau (Caucaso-Gedrosia) auDNA. FACT! This means that ancient Iranian (Aryan) and Indic people were mostly Caucaso-Gedrosia folks. They had NOTHIGN to do with Europe or EurAsian Steppes, it is YOU that have to deal with it