To put my two cents in about the whole "explaining the prophecy" debacle, the simple addition of this, taken from the second draft of Star Wars (Adventures of the Starkiller), would have been exposition enough as to what this "prophecy" actually states:
"...and in the time of greatest despair there shall come a savior, and he shall be known as: THE SON OF THE SUNS."
-Journal of the Whills
Edit it slightly to tone down the Jesus imagery and include something about bringing balance to the force:
"In the time of greatest despair there shall come a chosen one who shall vanquish evil from the shadows and bring about a balance to the Force, and he shall be known as: The Son of the Suns."
-Journal of the Whills
I think this fits the needs of a proper explanation of the vague prophecy, adding some purpose to its presence in the films. The "Journal of the Whills" could be shown to be a kind of Jedi bible.