Well, I'm in the minority here but I thought the finale was awful. Maybe I'm missing something but they leave Mike a note? Wtf? Are they going to give him detention next? It's the cartel! Why they just put two in his head?
As far as Jimmy goes, if he can't figure out that Chuck has screwed him at every turn, then he's not the brilliant tactician he thinks he is. Admitting to a felony given Chuck's past actions? No common sense at all.