LightPhoenix
First Post
Why is she back then, though? Or was that just part of the plan all along?
That remains unresolved. My theory is that they needed Olivia to swap masses with Fauxlivia when she crossed back over.
I am also not sure how the machine worked without Peter (or what kind of machine it was instead.)
The machine is a deus ex machina?
It's probably hand-waved as being immune to the altered timelines. After all, it shouldn't exist period since the Grey Future never came to pass. I wouldn't be surprised to find out Peter still exists because of the machine.