I have replaced him half a dozen times at high expenses against better ones.
After some time this stupid AI decided every time to bring him back. Sometimes after 2 or 3 turns, longest has been something like 3 months. Being a basic optimist, I decided every time to invest more points to get rid of him.
I even tried to put him in command of a corps in the middle of nowhere, just to get rid of him. In vain.
Last turn now, the AI even executed a flawless Guderian just to empty the office for him.
Is his position hardcoded or is the AI equipped with a sort of sadistic trait designed to drive innocent players into desparation?