Deathwings said:
I like to think that at the end of Fate and UBW, Shirou/Rin discover what is going on and exterminate Zouken with extreme prejudice.
Alternatively, at the end of both route, Zouken's ultimate goal is utterly destroyed beyond any hope of restoration, leading him to just give up and finally let himself die, freeing Sakura that way.
Well, if the first had happened, you'd imagine Sakura would be close to Rin, which would mean that she would at least be
mentioned. The second is not
impossible (although, given that the Grail Wars are still going on in this timeline, it seems somewhat unlikely that Zouken would just "give up"), but even if that
did happen, Sakura would still have a shit life, because she's been abused for eleven years. She needs her sister and the guy she loves to be around to help her get over the past (even if Shirou only ever takes a "caring big brother" role rather than being the lover that she'd
like him to be), and to provide someone she can
talk to about it, and if they don't rescue her they will likely never find out.
Also, wouldn't Shinji help Sakura at the end of UBW since he is implied to have been scared into becoming someone decent by his experience ?
No. He would stop abusing her, but to attempt to actively
help her would be very dangerous for him (because it means going against Zouken, who could trivially kill him (if he wanted to) due to the fact that he's just a normal person), and being scared straight is hardly going to
reduce his cowardice....