Originally Posted by Virgil Tracy:
“but what I mean is - we never saw the timestream from the GI's pov before Clara went in and started re-writing (did we ?) .”
We did - it was the same one we've been watching since 1963
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“so imagine we're GI , we go in and stop the doc from taking the faulty tardis , now that changes everything potentially , would any of the doctor's adventures as we know them have happened after that , would they all have been different ?”
Impossible to say exactly which "adventures" would be missed or handled differently - we just know that a significant factor in the adventures we've witnessed has been down to his Tardis getting him to "where he NEEDED to be" even if he didn't know it.
Some adventures directly lead to others so not going to planet A might mean he can't go to planet Y years later cos they destroyed each other in a war. And it's not all about prevent an adventure from starting - the GI may have let him land on Skaro but turned the Thals against him - so no medicine and Susan's dead.
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“ the GI would presumably ruin any other good works , and etc. leading to the destruction of the universe .”
Potentially, yes - but even with the GI in his timestream (and this is where it is 100% necessary for the "GI and Clara were always there" idea to be wrong) without the Doctor knowing his life was being dicked about with, he's still The Doctor - incredibly smart and resourceful. From the Doctor's point of view, that would BE his life and he'd be working to win just as hard and well as he does in the unaltered timestream. Ultimately, we know he "lost" cos we saw him dying but it wouldn't be as simple as his losing every battle and never been able to win any battle or prevent any disaster (otherwise, none of the plot could work cos we wouldn't have had Big Bang 2, for example)
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“ok , now onto a different point - then Clara goes in and starts undoing things , the GI must be wondering whats going on , didn't he just alter that ? now its back the way it was , wtf ?”
It SEEMS to be "back the way it was" and the end result APPEARS TO BE the same (even if some detail of the way he got to that point are slightly different) - but we don't KNOW that everything's exactly as it should be.
In terms of the GI realising that his changes were being reversed, he would never know. Once "he" entered that timestream, he ceased to be a single consciousness and existed (much like Clara) as millions of separate GI's. Each GI-clone did something nasty but they each lived entirely in linear time (just like the Clara-clones that all had their own birth, life and death). THE GI ceased to exist so he simply couldn't know that something done yesterday had been undone by a Clara.
Example - GI-number 30001 tells the Doctor to take the first Tardis on the left. He then walks away and Clara-number 2745 turns up and says "Don't take that one". That GI has no idea she was even there - he's done his "job" and that's the end of it for him.
It's basically the same as the Clara's - Victorian Clara genuinely had no knowledge of Oswin.
Where it becomes interestingly different is that Clara-prime - the "real" Clara appears to have some "memory" of actions undertaken by her millions of "copies" - which should be impossible but can no doubt be given a suitable DW-ish explanation by the writers - plus, of course, she was saved from the timestream, unlike the Great Idiot (really should have planned ahead if he was that smart).