Remember, it was only after the Primal Monitor sensed the 'flaw' within itself(ie. the prime multiverse), that it created the first 'Probe' to investigate said flaw -- this Probe was Dax Novu. When Novu encountered the stories he found within the multiverse, it drove him mad and forced him into seclusion -- essentially corrupting him into Mandrakk.
IOW, the multiverse/flaw existed before the creation of the Monitor race/realm.
Isn't it implied in Infinite crisis(Alex Luthor said that everything come from Superman and Batman) and Final crisis and All Star Superman (and Supergods written by Morrison) that the multiverse(DC entire stories) come from the story of Superman and Batman?
It seems that some writer add metafictional history of comic book into actual cosmology.
What do you think?