Poaching candidates, negotiation, above-street compensation for new analysts

Heard a rumor that a junior from my college (top target) received an internship offer from a BB (for S&T in NY). What makes this story different is that he/she was offered a guaranteed full-time spot, and along with that an FT salary of roughly ~2x regular compensation (i.e. base of $150k, with potential for the usual bonus). Apparently, the head of the S&T/Markets division personally called this person to give them the offer.

Is it possible any of this is true? I know the student in question is very smart, hardworking etc., and they had interned at a similarly reputable firm their sophomore summer. But a guaranteed FT spot, and 2x the salary?

Does this happen with other top candidates as well? Are kids who interned at GS after junior year offered additional compensation to jump to, say, JP Morgan, or maybe a boutique like Lazard? Do Consulting or Tech firms dangle extra cash in front of possible switchers? Do these in-demand kids have the ability to negotiate - if not for compensation, then maybe group placement etc.?

P.S. Not sure if the kid is going to a prop desk; could that be the reason for the extra money?