A general idea of how the Empire treats criminals

[Omni]

I'm not quite sure exactly how law works within a verse such as the Empire. Would they set him some other kind of momentous task? Would they just outright banish him? (Though I honestly doubt this, since the crime Jon committed wasn't all that serious, and the Empire don't seem like ones who'd skip the opportunity of puppeteering a lost and confused Prime).

This. Primes are kind of an exception when it comes to the law, especially when it comes to the Empire, because they're willing to do anything to get them on their side. As long as they believe they can be controlled or manipulated to some degree, and aren't just going to completely screw them over, they will do whatever it takes to keep them working for them. That would include potentially manipulating them into committing MORE crimes that they then have to 'repay'. I guess it would depend on the individual who is 'directing' that particular Prime 'case'. I mean, feel free to make up Imperial officers and such, Dredd can't preside over everything (and he's actually far less corrupt than many in the force, I would suspect, and probably hated by many of his subordinates). So basically be as creative as you like.