it's pretty open! basically, when he first went on the run, he spent a little time in the crime capital of the galaxy, and i'd love to see the person who helped him not immediately die, because he absolutely would have on his own. someone who started with money and fell on hard times could be interesting if they knew one another back in the day, and meet again when everything's changed. he was also really involved in radical groups on campus during his very long career as a student and then a professor, so there's a lot of room for connection there, and he'd have trusted someone he worked with / had as a grad student / etc.