User blog comment:Geekius Maximus/Elizabeth's Success?/@comment-75.36.142.143-20140216134953

Has to do with the 'infinite' stuff they are inconsistant with in the plotline. Other Columbia's exist - an infinite number of them actually (its what the 'theory' they base all this on says, anyway). SO many other Columbias exist (infinite ones). And remember they have (in-game) some kind of 'time travel'  (not part of that theory except simulating it by traveling to other similar realities which are out of time sync with the one you see in the game) so just step sideways there to before whatebver happens and pull stuff through... or pull the stuff from particularly similar other realities which were never 'fixed' whenever needed.

Its all just whatever they want to be in the game --- no real logic to it (at all).