I think that the gist of the episode was simply that in order to be brave you must first be afraid. The point of having the Young Doctor at the end was probably to drive that home, rather than to aggrandise Clara.
Some thoughts:
Some thoughts:
- Twelve exists, so presumably the "grave" on Trenzalore never did and neither did Clara's "Impossible Girl" lives, nor the Great Intelligence's attempts to influence the Doctor's history in the first place.
- However, in order for the "Born on Gallifrey, dies on Trenzalore" version of the Doctor's life to have been valid, it should be pretty much impossible for events in the Doctor's post-Trenzalore life to be necessary in order for him to have left Gallifrey. Therefore it seems that he would have left Gallifrey without Clara's intervention.
- If this is Gallifrey, then it seems that the Doctor can, in principle, get back to present-day Gallifrey by just travelling forward in time. (Maybe that was what Twelve was at in The Day Of The Doctor.) Any time lock or banishment to another universe should be circumventable - in part, at least - if he materialises just before it takes effect.
- The TARDIS can find any companion the Doctor will ever have met. Rory and Amy will probably never hear about that, though, so I think the Doctor is safe.
- The Doctor apparently lies in this episode, and probably lies about more than one thing. It looks like either he's regaining an old skill or the supposed 800-year embargo on his telling of fibs wasn't quite that.
- It looks like Gallifreyans build barns to last, even if the War Doctor was really only 800 years old or so.