[Dunbar]

I'm not sure that the Inception on Fisher Jr. ever actually occurs, as I doubt that Cobb ever escaped Saito's dream from the beginning. It is suggested in the movie that the subconscious attacks the architect of the dream first. In the beginning of the movie the last we see of the first architect is him being bundled away by Saito's goons. Saito then crafts an excuse for Cobb to end up at peace, lost in his own subconscious. The Saito living in limbo could be a projection in the same way that Fisher Jr. creates a projection of the guy the forger was mimicking.