I think one of the reasons Howard is so hard on Kim is because HHM not only got her out of the mail-room , they put her through law school and hired her as an associate after she graduated. White shoe firms generally aren't known for that kind of generosity and when we are introduced to Kim she is sitting next to Howard at the conference table. It's easy to make Howard the focal point for resentment as a nepotism poster child, but he knows the names of the minor employees , I doubt that Chuck bothered with that kind of personal touch. Keeping a major firm aloft when one of your senior partners- rainmaker is mentally ill can't be easy , and I think Howard deserved more from Kim, it's one of the few things about Kim that I can find fault with. Her loyalty to Jimmy will be corrosive in her professional life and poisonous in her personal one.
Besides he was wearing the green shirt of evil, whenever someone wears that color in this universe trouble follows, along with the other cardinal rule that there is always something more that can be lost. Watching Jimmy irretrievably become Saul will be very painful , but I'm not sure that Chuck winds up dead or Kim goes back to a small town, it's entirely possible that they live in the same city but a different world.
I think Mike is going to enlist Gus to help with Nacho's problem.
