I agree with this post, a billion times over aside from the pittance part. Although I haven't read any more of Jonas than what was written of him in Wizard and Glass, I do feel like he held the potential to be a force of good, rather than wickedness. In the end, the worst blow anyone ever inflicted on him was the exchange with Roland, where the teen says that he is an exile of Gilead. A failed gunslinger.
The fact is really hurt Jonas says a lot of his character. I like him as a villain.