Let's say you were writing the prequels: how would you have kept secret the fact that Vader is Luke's father, so that an audience who decides to watch the films in chronological order, is as shocked as Luke is when they hit Episode V? Alternatively, though, do you think preserving it was even necessary? I'll say that I have an idea on how to pull it off myself, but since it's very convoluted and not very well thought out, I might post it later when I have more time. But what do you think? Would you have tried to save the reveal, or would you have even gone to the trouble?