I think this theory would have worked, if it had actually taken place in some sort of alternate timeline. Remember: the MOTD gang were executed in "actual time", meaning that all of the stuff they get to do in MOTD never happened. Ferguson lived, Alcatraz was never infested with zombies, and the Warden may have been a normal man who probably never worshiped Satan or anything related to him. Why? The Alcatraz we've all come to know and love may be located in another dimension - one that ignores the rules of space and time, a limbo, if you will.
But rember that the rift is broken.
All these events would have panned out once the rift was mended as it would have made them go back to where it started to brake. Which would have been before furgi' died.
Hmm, that does make sense.