But this is the nature of how legends grow. Thirty years after his death, the stories may say that Vader personally destroyed Alderaan, routed the rebels at Hoth singlehandedly, and destroyed the Emperor and then relinquished his physical form out of his own desire, ascending directly to godhood. It would be interesting to see a character who genuinely believes these things, and it doesn't diminish the character of Vader to have someone best him - on the contrary, it may show that physical power is not what makes a character great.