One of the paradoxes of India is its astonishing linguistic diversity (they speak about five hundred languages there) compared with its cultural unit… - Bernard Sergen

The Vedda, the Melano-Indians and the Indus people and the actual inhabitants of the northern half of India, which classical anthropology used to class as Mediterraneans, all belong to one same human 'current' of which they manifest the successive 'waves'. Everything indicates, physical traits as well as geographical distribution, that the Vedda have arrived first, followed by the Melano-Indians, and then the Indus people."... "The Italian anthropologist [Mario Cappieri] has emphasized not only that the skulls of Mohenjo Daro resemble those of today's Sindh and those of Harappa resemble those of today's Panjab, but even that the individual variability is identical today to what it was four thousand years ago.

The present stage of research effectively permits tracing an Asian origin for the Indo-Europeans well before their dispersion.

Indeed, from the Indus eastwards, we lose track of this Bactrian invasion. Sergent himself admits as much: “For the sequel, archaeology offers little help. The diggings in India for the 2nd millennium BC reveal a large number of regional cultures, generally rather poor, and to decree what within them represents the Indo-Aryan or the indigenous contribution would be arbitrary. If Pirak (…) represents the start of Indian culture, there is in the present state of Indian archaeology no ‘post-Pirak’ except at Pirak itself, which lasted till the 7th century BC: the site remained, along with a few very nearby ones, isolated.” So, the Bactrian invaders who arrived through the Bolan pass and established themselves in and around the border town of Pirak, never crossed the Indus.