Sorry bro, I have also read this genetic theory in detail posted by you which is this thread. The longer the period of mixing, larger will be the share of population who will show that DNA either Y or M2.The Indic and Arabic DNA came in the last 1350 years.
An early post if mine already alludes to that.
And how the absence of strict endogamy in the laiety (post Islam especially) contributed to that admixture further.
Back to the paper.
Cheers, Doc
Let me tell you something very surprising. Islam spread across Gibralter within 50years but it took them 400 years to come to India as invaders. They were in Malabar as traders within 20-25 years. They came to Sindh in 712 and were thrown out within 20 years. They won the first battle against Hindu Shahi dynasty of Afghanistan in 1025 in Punjab and then marched on to Baharaich. No turkic or Persian ever had the courage to invade India again for next 150 years. His army had a very large contigent of converted Persians.