Ever since I saw Empire of Dreams, I thought what a cool idea it would have been if Obi-Wan killing Luke's father had been the big revelation instead of Darth Vader being Luke's father. Maybe this is just me reacting to what has become, after 26 years, rather too well-known and not at all surprising, but I still think it would have been cool. I see two ways this could have played out:

First of all, Vader's motivation for telling him would be to try to shatter Luke's trust in his own mentor and, in his weakened emotional state, convince him that Vader's way would be the right way, as opposed to someone who would kill his father. That motivation remains constant in both scenarios.

In the first scenario, it is taken literally and is very true. For whatever reason, Obi-Wan Kenobi killed Anakin Skywalker, who is not, in this scenario, Darth Vader at all. So Ben lied to Luke about it. There was most likely a totally justifiable reason for this, like it was an accident or an act of necessity, and Darth Vader, who was a pupil of his before he turned to evil, witnessed this. But Ben, needing Luke to fight for the cause so badly, didn't want to admit what he'd done, and, instead, put the blame on Vader, who was the cause of the suffering in the galaxy, in order to give Luke a more personal vendetta against him. But now Luke's trust in his mentor has been shaken, and he is confronted with a choice. And whatever that immediate choice would be, there would have to be some confrontation with the ghost of Ben in the next movie where he would have to explain himself, and it would have to be up to Luke to struggle between fulfilling his destiny by destroying the Emperor or staying out of it to no longer be affiliated with his father's murderer.

The second scenario fits in much better with the way the trilogy is laid out now. Vader still gives the same revelation that Obi-Wan killed Luke's father. In this case, though, Vader is Anakin Skywalker, and he is somewhat lying in order to woo Luke over to the dark side. But, at the same time, it plays more into the "certain point of view" logic, inasmuch that Vader blames Obi-Wan for what happened to him and believes that he figuratively killed him. Then, in the next movie, Yoda and Obi-Wan have to convince Luke of what really happened, and it would give more weight to the almost useless line about point of views, which, along with "the other," felt like two major plot points that never really got off the ground.

So, any opinions?