Wow, in just a few chapters his jobs were messed around with quite a bit, huh? He got criminal jobs and lost jobless, then got rid of his criminal jobs to get his other jobs back, then a profession stealing jewel stole his commoner job which left him jobless again, then the profession stealing jewel was shattered so he recovered his commoner job but apparently kept his jobless status? I assume that he still has his high levels in jobless since it's just that he couldn't equip the job again after it was unequipped. So he's back to how he was and he got a few criminal skills too.
So there's a sword that can steal experience, and a jewel that can steal the profession and make you jobless; imagine what they could do with the knowledge of what the jobless class can do. It won't be easy for anyone to do what Ichinojou did since he has cheats that make leveling up easy, but it would definitely be quite the paradigm shift if people learned what leveling up jobless could do. The strange circumstances that caused Ichinojou to lose jobless shouldn't occur again, but if they ever do, he's got the gem-craft job and may be able to learn how to craft a profession stealing jewel. In fact, he can make his followers jobless and since he can share the experience gaining cheats with them, he'll no longer have to edit their jobs for them (then again, I'm not sure there's a purpose to do that since it seems they've already gained the ability to share his skills).
It's really quite careless of him to let that suspicious soldier get away. Also, the demons behind this apparently have someone with a high level in gem crafting. The previous demon king also had a job in crafting so that's pretty interesting.