Primarily because Model shot himself and Rundstedt fought in the West.
Model was a skilled general who though fairly amoral was unlike Manstein in that he was at least willing to fall on his sword instead of making excuses like a number of German generals for their actions and their loss. I believe he also told Hitler to pound sand when it came to using his troops to put down the Warsaw upring. Rundstedt was an old man who though being a coward when it came to dealing with the Bohemian Corporal was at least willing to be fired twice I believe for saying the war needed to end.