What made it change from the First Timeline to the Second Timeline was Hiro's having gone back in time. That was the only change--and the only reflection of it was that Claire was still alive. IOW the same things happened as far as Niki/DL/Micah in both the 1st and 2nd timelines?
Possibly the change from 2nd to 3rd was Hiro's having gone to the future, come back, and called Nathan a birran? Maybe that third voice (instead of just Peter's and Claire's) was what tipped the scales to make Nathan stop Peter.
BTW I am so disappointed that Candice turned out to really look like Missy Peregrym. Really, really disappointed.
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Possibly the change from 2nd to 3rd was Hiro's having gone to the future, come back, and called Nathan a birran? Maybe that third voice (instead of just Peter's and Claire's) was what tipped the scales to make Nathan stop Peter.
BTW I am so disappointed that Candice turned out to really look like Missy Peregrym. Really, really disappointed.