It must have been terribly frustrating for poor Count Dooku, getting older and older in his position in middle management as young Sith turks are fast-tracked into being deputy Sith lord. I mean, the guy is ancient. All the other young Sith must have wondered why, after his long years of service, he was still stuck on the fourth floor, corner office or no. Rumours of some scandal, perhaps involving Darth Sidious’ wife. Or could he just not handle the pressure?