Darth Vader doesn't strike me as being very ambitious. I really can't imagine him being the guy in charge. I picture him as kinda floating thru the days, acting according to his role, doesn't really care either way, just wants to do his job right. But not that he didn't care about winning or coming out on top. When anything like that was required of him, he would snap right into it and be ruthless and do whatever it takes to come out of a situation on top. But I almost imagine it like 70s Elvis. Sure, when he has a show to do, he gives all of himself to it, that's just his nature, it's what he was born to do is get up there and sing and be Elvis, but really, looking at his life, he didn't care about anything. Day after day this doped up animal living in a house, wandering around from room to room, smoking cigarettes and eating pills, staying up all night, sitting in a chair, waiting to die pretty much. I'm wondering if anyone can really picture Darth Vader being in charge of the Empire, and what that looks like to them. I think if that happened, it wouldn't be long before Luke killed him and took over. I can only imagine how frustrated a Dark Side Luke would be dealing with him as the boss. the Emperor and Luke... now that would've been a scary teamup.