I know Im posting to my own post, but I forgot something: One other Leveler form could have been the player from Pathways into Darkness. If that dreaming god awakened then Earth would be destroyed which means there would be no Colony established on Mars, which means there would be no Marathon built, which means Durandal would not have called the pfhor (if you believe that) which means the player, the leveler, would not have bean around to topple the Pfhor. Remember that the Player is also Destiny and in my opinion, Destiny is predetermined.
Okay, Okay, Ill shut up now :P