How would things on the Eastern Front developed in '44 if Manstein had not been fired by the Austrian Corporal in early '44? Would he have recognized the threat of BAGRATION in June '44, not to mention pushed for the withdrawal of Army Group North from the Baltic States once before they could be cut off?
Or would he have been shifted to the Western Front after Rommel was put out of action on 17 July 44? He never did face the Americans and British, after all.