I'm starting up a new group soon and one of my players has an idea for his character that I'm having trouble resolving. Basically, he want to play someone who used to be of a medium rank in Black Sun (well below Vigo or a Vigo's lieutenant, but higher than a grunt) but was kicked out after making some kind of mistake. He specifically does not want to have a character that is on the run from Black Sun as he feels this backstory is cliched. In other words, the character did not choose to leave but also Black Sun is not trying to kill him.
My first and main issue with it is that Black Sun is known to be incredibly ruthless and unforgiving. I'm unable to see a situation where a failure was just met with a dismissal. Which leads to my second issue which is what does being kicked out of the Black Sun truly entail? Like, at some point, I feel like there's gotta be a, "if you come back here, you're dead," or, "if you talk to X, you're dead," or even, "if we compete with us, you're dead." Otherwise, this PC gets all of the benefits of the reputation and contacts of a low level crime lord without any drawbacks.
Anyway, any advice on how to handle this situation (beyond just saying no to my player, which I would prefer not to do) would be appreciated.