I do not know about the intricacies of the Varna system.
However, I do know from living in TN for decades that the OBCs, the Dalits as well as the Brahmins, the Muslims and Christians of TN have more or less the same racial ancestry if ancestry can be inferred from physical features and skin colour !!
While this is so, many Brahmins in TN (who can be referred to as Black Brahmins with Negrito-Australoid-Dravidian features as distinguished from the North Indian White Brahmins who, as per research in genome mapping done by various agencies, belong more to the Proto Aryan race) derive secret pleasure in saying and trying to lead others to believe that they are 'Aryan' unlike others who are 'Dravidian' !
While there are several nations where people practice segregation and discriminate against others based on race, colour and etnicity, we in India are unique in that people of more or less the same colour and race practice apartheid with equal zest !!!
