See I have a problem when people mention haplogroup J2 with Sumerians, the reason for that is because there has been no ancient DNA of Sumerians found, not to mention that the haplogroup diversity within that region today is very great with many different haplogroups.
Some Indian poster here (JoshK) and other old user (Iyengar) used to argue the purest racial Dravidians were the Indo-European Northwestern Lower Castes in India (but not Pariahs). These people usually look Dark caucasoid, even if some have Aboriginal ancestry, that's not their predominant ancestry. If you ask me, it sounds likely to me.