At one point it says: "When all hope seemed lost, that girl (Rose) came
back to him and saved him. And that was the moment, the place where the
Doctor came back, too, and realized that he was still pleased to be
that man even after all he had done."
Look at 9 (Eccleston): tall, average, unassuming, mild haircut, everyday clothes.
He was a shell of the former Doctors. He lost himself but Rose re-awakened within him the need to set
things right, and he was back to himself, 10 (Tennant). Buuuuuut...
11 (Smith) lies a lot, he's covering the truth because his companions get too
close and he doesn't want them to know what happened during the Time
War. It all hinges on how John Hurt really plays into the story. Each regeneration seems to have a basis on the previous ones.
And a new theory: Has the Doctor, 8-11, been through the time war yet? (We can only assume that between the split of the old and new series that that was when the Time War occurred.) Does the Doctor know about it because he's already met his future self? Has the time war even happened yet and is 9 (Eccleston, regenerated from 8, ended the War) or 8 (regenerates into 9 due to an injury from the War) actually responsible for it?
OOOORRRR has a future incarnation of the Doctor went back and stopped
it all already and told the Doctor that we currently know all about it? Maybe he
set in place a permanent state in time by banishing the two races?
The Time War HAS and HASN'T happened yet. It makes sense to me but I can't make you understand it. The
War has happened, but its our current Doctor's destiny to go back in time and
end the War. I guess that's about the best way I can describe it.