I noticed this as well. I think both the blond lady in charge at Waticorp and the Priestress in Arcadia are the same person. The lady in Waticorp could easily be using the device to move between Stark and Arcadia. Even enough Morpheus, one can easily have full control of the dream. Other than shifting, dream is also the other way to travel between the two worlds.
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On a different note ... is Faith really dead? She was stuck in "Winters", neither in Arcadia or in Stark. When you are in a dream and you fall asleep, where do you go? If your body is still alive you go back to your body, but if the body isnt there do you end up going else where? Like Zoe said at the end, you are never truly dead if you are dreaming.
