This is easier said than done. The boss’s boss might not want to get involved with the low level details of the boss’s team. After all he hired boss so he could

This is easier said than done. The boss’s boss might not want to get involved with the low level details of the boss’s team. After all he hired boss so he could delegate to him. He’ll chat with the boss after you leave. The upshot is they’ll tend to circle the wagons, especially to avoid the risk of a lawsuit for wrongful termination.