Kaep is meeeeh... hard to tell if they are ruining him not playing to his strengths - or if he really just regressed into a bottom tier QB.
Look at Sanchez, went from a total inept Jets offense (where he looked like the worst QB ever), into a very productive NFL QB. It just shows how important having a good system around a QB can make even a low/ marginal player, and turn him into a good/ productive one.