This comment made me lol.. Not sure if you were just joking or you were unaware that case system is overlaid on racial/genetic subtleties of Indian subcontinent. Brahmin casts tend to be light skinned. For outsiders, all Indians are same, but believe me, there are subconscious clues a trained human mind (through upbringing, culture etc.) can pick up.
This comment made me LoL but yes there's some steppe ancestry in Indians. But doesn't considerably vary among castes. I guess most of "upper castes" have something like 10% more steppe ancestry on average. Brahmins have established themselves as top because they were priestly caste and not the ancestry. (Indo European migration happened much before caste system formed).
