Walter said he would be deleted by the universe at the point where that timelines' Observers invaded, by going to the future he sent the scientists onto a different evolutionary path, the trigger being they did not need to sacrifice compassion for intelligence, that doesn't mean the Observers were never created, just they would be created differently, and as such, wouldn't invade.
September didn't save Peter in that timeline as Peter was erased after the stepped out the machine (at that point he created that paradox - remember the two Walters arguing about who caused the damage, not that one stole the others son), he only came back because of "love" and when he came back, the timelines didn't automatically reset (nobody knew him), in that timeline he was saved by the fisherman in the boat on the lake where he surfaced as an Adult.
Walter was there all the time up until the invasion, that was the point of the last video where he said he was there one day, then gone the next, the intention was to inact the plan in around 2015 but Walter put them into Amber instead to avoid being caught as the Observers invaded early and September/Donald hadn't sourced all the parts necessary (it's explained in the future episode from last season when they originally invaded).
This is the problem with trying to tell a time travel story, some stuff get's screwed up and doesn't get explained very well. As far as I can work out, everything post Peter return was real, and everything post invasion isn't real anymore, we saw the story in non-linear form, if we saw it linear, Season 5 wouldn't exist
They did make a slip up with Walter saying he stole time with Peter, unless of course Walter remembers the original timeline too - did they establish that or not?
September didn't save Peter in that timeline as Peter was erased after the stepped out the machine (at that point he created that paradox - remember the two Walters arguing about who caused the damage, not that one stole the others son), he only came back because of "love" and when he came back, the timelines didn't automatically reset (nobody knew him), in that timeline he was saved by the fisherman in the boat on the lake where he surfaced as an Adult.
Walter was there all the time up until the invasion, that was the point of the last video where he said he was there one day, then gone the next, the intention was to inact the plan in around 2015 but Walter put them into Amber instead to avoid being caught as the Observers invaded early and September/Donald hadn't sourced all the parts necessary (it's explained in the future episode from last season when they originally invaded).
This is the problem with trying to tell a time travel story, some stuff get's screwed up and doesn't get explained very well. As far as I can work out, everything post Peter return was real, and everything post invasion isn't real anymore, we saw the story in non-linear form, if we saw it linear, Season 5 wouldn't exist
They did make a slip up with Walter saying he stole time with Peter, unless of course Walter remembers the original timeline too - did they establish that or not?
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