This makes one wonder if the Roma Migration is the lingering historic memory which laid the seed for AIT...Look at the bottleneck in Kazakhstan. Isn't it the same bottleneck through with the Aryans filtered in? By the way, how is this represented in Indian literature? 
And then, look at this. There are two J2 blocks. Has it got anything to do with the fact that the whole area is a dense and impassable forest because of which divergence is noticed?
Now, if you look at the population composition of the Central Indian Tribes, Women are from West and Men are from East. So, what happened? Militarization and resettlement? Or gravitation towards the dominant Indus Valley through paths of least resistance?
This is the important bit from that presentation @JoeAgneya shared. A clear cut sampling issue. Is this bias or limitation?
@bennedose hints it as an outcome more out of laziness(though there is some bias present).
Coming to the inferences of the paper.
1. Everyone in India has every gene marker and even the supposedly the most ancient ones like the Mundas had a massive gene pool change around 4000 years ago.
2. R1a is present in India for more than 25k years. RIP AIT.
1. Everyone in India has every gene marker and even the supposedly the most ancient ones like the Mundas had a massive gene pool change around 4000 years ago.
2. R1a is present in India for more than 25k years. RIP AIT.
Further, assuming these Aryans existed and they came from Steppes, after the Baltic Crusades, how can you even claim to be the successors of Aryans? You don't follow Perkunas or Dana'an. You violently subjugated those who followed those gods and imposed your religion on them!!
See...another link to their day to day life added to AIT corpus - Crusades by the Aryans against the Harappans. Sistema de Casta and fast moving horse based cavalry comes from Americas, Roma Migration and Crusades come from Europe, Aryan scattering comes from Turkic migrations.
Forgot to mention. Turkic migrations also started in the same area.
