Changing 'Who'story

Moffat has a record on not keeping promises and on dubbing every single finale written by him 'a gamechanger', something which will have an impact on 'everything', including the past, the present and the future of 'Doctor Who'. That's the idea, that's his promise. But usually he does  not live up to it.

 And then came "The Name of the Doctor" and Moffat kept his promise: with that episode he did changed 'Who'story forever and by doing so, he made himself the most important showrunner of all time. You might think that's an exaggeration. But you have to admit that none of his forerunners have been brave enough to leave their permanent mark on the show's history, at least not like that. We got tiny bits like occasional references about the Time Lords, about Gallifrey, his family, about that famous 12 regeneration rule which has managed to stick around; but we do not know why he left his homeplanet, not to mention his real  name, or  the reason why he is obviously not using it.

Now, revealing certain things about the Doctor's past comes with certain problems. Not knowing has become a permanent rule, a fixed point, one of those few things everyone could rely on. Which means that everybody working on 'Who' before Moffat shaped the series accordingly. So, when Moffat has come along and introduced John Hurt as a former Doctor* the first thing coming to any sensible fan's mind is the question, 'so where do we fit that one in then?' 

On a basic level, there are two rather plausible options. First of all, there are, strictly speaking, no canonical records on why Hurt's Doctor could not have regenerated into William Hartnell's Doctor°. One big advantage of this theory is that we know that already back then the Doctor has not been using his *real* name. And by featuring the really first (maybe-not-yet) Doctor there is the chance of learning the *original* reason of why he decided to go by 'the Doctor'.

But let's not get too excited because at the same time, this is the very reason why it's not really likely that Moffat will tell us about the Doctor's actual pre-series past. It would break 'Who's 5o-years old rule. Which means that it's more likely that Hurt's Doctor is set after number 8. This is supported by the fact that we know that somewhen between McGann's Doctor regenerated into Eccelston's, the Doctor was fighting in the Great Time War#, during which he did things he is not proud of, like destroying (time-locking) Gallifrey and the Time Lords. A point in favour of this theory is that the 11th Doctor says about Hurt's Doctor that  

The name you choose is like a promise you make.
 He's the one who broke the promise.

From a linear perspective, although that's not necessarily the way 'Who' works, to be able to break a promise you need to have made one in the first place. So maybe, back in the dark old days, after doing something even more terrible than he did in the Great Time War, he decided to make time forget his real name, and started calling himself the Doctor, and by doing so he made the promise that whatever happened back then will never happen again, because he'll see it as his personal responsibility to take care of it. And then he becomes involved into the Great Time War and he fails to keep his old promise.

The second, even more important hint in favour of this theory is that the BBC asked Christopher Eccelston if he was willing to be involved into the 5oth anniversary. He obviously said no.

Solving things like this we would still get a rather awesome episode, even though it would only fill the gap of the Great Time War.

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* Strictly speaking John Hurt's Doctor is  not a 'Doctor' as the Doctor does not grant him that 'title'. He simply does not deserve it. This means that luckily we do not need to change the numbering. But for the lack of a better alternative, I hope you don't mind if I'm using the word 'Doctor' for John Hut's 'Doctor' anyway.

°Well, looking at the plot as such, there is a problem after all. We know that Time Lords are supposed to have two hearts. However, this fact was not introduced for several seasons, because of which the 'first' Doctor appears to have just one heart ("The Edge of Destruction"). To resolve this plothole, some people came up with the idea that Time Lords get their second heart after their 1st regeneration, which makes Hartnell's Doctor the first. However then Hurt's Doctor cannot be placed before him; (then again, in "The Wheel in Space" featuring the 2nd Doctor, he still seems to be one-hearted.) Naturally, this rules does not actually feature in any episodes, for what it can be dismissed.

# Interestingly, the book in which Clara comes across the real name of the Doctor has the title "The History of the Time War" and not "The History of the Great Time War". Of course, this could be a simple mistake, but maybe there is more to it. After all,  it is possible that the Time Lords were involved in more than just one Time War.