»my theory about the old guy in the train station«

I think that the old guy in the train station may be a previous "one" who just after returning to the source pick the people to rebuild zion, but just never really went all the way through with it, just like Agent smith didn't return when he was destroyed by neo. I think that is why the old guy know about the war and why in the revolution trailer he was able to punch neo into the wall. He has the same strenght as the one he just made the wrong choice in picking the door.

mmmm..... probably not. actually the trainman is explained on the official revolutions website. basically he runs all the travel from the machine world to the matrix.

So? He could be a former One nevertheless.

I agree that the "One" does not surface until well after the other "one's" are dead. That is the prophecy.

"There once was a man who woke up and freed the first of us. He made Zion. It has been prophesied that he will return again to stop the war."

Not an exact quote, but similar.

If it looks like a duck, walks like a duck, talks like a duck,
but is in the Matrix:
It's probably a program.

ok........................