Star Wars Question

Here's what we know:
(1) In episode 1, Anikan Skywalker is claimed by his mother to not have a father, and he might be the 'one' chosen to restore balance to the force by destroying the Sith.
(2) In episode 3, Anikan falls to the dark side and thus is unlikely to be the chosen one.
(3) In episode 4, a new hope is identified -- Anikan's son Luke.
(4) In episode 6, Luke turns Anikan back to the good side, and Anikan/Vader kills the Emperor.

So, who is the chosen one? The obvious answer is Luke -- he 'won' and Vader and the Emperor both died. But, it turns out that Anikan is the chosen one who killed the last Sith and Luke is merely the catalyst who help fulfill the prophesy. Why do I care about this?