Indus Priest King
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I have not studied in detail when and why some ancestors of Brahmins moved to India, but clearly, they have a connection to Pakistan, albeit a small fraction of their genes - but most of their genes is typically Indian that they share with neighboring Indians.
My guess would be that a small number of Vedic invaders moved into India. It could be that they were indeed looking for greener pastures, or maybe inter-tribal conflict drove some few weak tribe(s) further into Indian peninsula.
The Vedic connection is proved by the fact that Brahmin men carry R1a in very high frequencies. (There are other lower status/caste groups with some men carrying R1a, but those are most likely due to Non-Parental Events).
However, to put things in perspective, Brahmins are only 1-3% of India's population. And the fraction of their genes they share with us is also not very significant.
Battle of Ten Kings is your answer. The reason some of them left is because the Indus Valley was in a constant state of battle and war. It had several dozen kingdoms, but none were powerful enough to take over the other...so it became a stalemate.
The Bharatas and their allies (the Kurus and some other tribe) left the Indus Valley after 1300 BCE and settled in Ganga.