RicOlie_2 said:

But the whole point would be to throw people off a bit. Rather than ruining the reveal in Episode V, the idea is that it might even be more shocking to find out who Vader is if we have been mislead (though there would be clues along the way, and foreshadowing, but not obvious enough that one could easily figure it out).

EDIT: And the point would not be to confuse people, but to mislead them, until they have a moment of "now everything makes sense--I can't believe I didn't figure this out before" after the surprise of the reveal in ESB.

that would only work if we never saw 4,5,6 first... thats why I asked are you talking about showing the six movies in chronological order...becuz then you can do what your talking about in terms of misleading the audience.

But if we've seen 4,5,6 first then we KNOW vader is lukes father, vader and obiwan had a falling out, luke and leia are siblings. vader is anakin skywalker. So knowing that if you show 1,2,3 and focus on a bunch of people who ultimately have no direct impact on those points listed yet get all kinds of focus and attention it would ultimately lead the audience into thinking "wha??" The function of a prequel isn't some much what happened but how it happened.