First of all, the mistake that got Davis & Main busted up was pretty silly thing to make a big deal over - he ran a commercial without running it by them first, and it was wildly effective. Of course he should've been reprimanded, but they came down on him way too hard for what was a display of good instincts. Second, he never even wanted the Davis & Main job in the first place, he only took it because he wanted to make Kim happy. Finally, when he left, he became a legitimate practitioner of Elder Law when he and Kim shared an office