Ah, ok, that makes way more sense than what you first said, which was that the Oblivion War would somewhat LEAD to the Outsiders return/awakening as opposed to preventing it.
As the theory goes: The Oblivion War works only on the premise that the targeted Creatures REQUIRE a connection to Mortal awareness in order to manifest in the Mortal World, or else they have no grip on the reality and are left floating in the distant unconnected reaches of the NN. This makes fine sense for all the NN demons etc that keep being mentioned as having varying degrees of interest in the Mortal World. It makes less sense in the case of the Outsiders because a)Outside and Oblivion are different things, and B) Outsiders dont /require/ a connection to Mortal Awareness since they are currently attempting to get in via other means. The fact that there is a constant conflict at the Outer Gates being waged unknown to mortal race would strongly indicate that they do not have the same requirement for Mortal Awareness that NN natives do. So the theory goes, anyway.
Ah... let me
attempt to smash this one. Outsiders... look at Fearbringer, the idea behind him has not, and maybe
cannot be forgotten by humans until humans no longer have a concept of fear, so, fear will always have a representation in reality. The same thing with Hwwbh, he's actually a psychological part of humanity,(i'd have to find the post on the jbit that has the right link to a really good article on it) the 'demon' you can't quite look at, that which stalks us all, Death.
To be expelled from reality in my opinion simply means you have no creation oomph, no payment on Rent or Purchase in the positive. Maybe even YOU died, even if your idea did not, in which case, as I suspect, Outsiders are the versions of Idea's/god avatars who died, maybe even the originals, and those who were intentionally left out of the little playground our God made. BUT, whom are not forgotten, whom we actually put in our own mythology for their deaths, who we also remember are not exactly all good with reality or humanity, Some of which only existed perhaps before reality truly began.
Look next at the Lord of Slowest Terror, Time, Chronos, whatever you wanna call him. His being dead/torn apart is kinda necessary for reality because of space-time. That's one of the clue's left for us, Outsiders get in, everything Stops. Because Time is no longer in pieces?
So this could also explain, in part, why the Outsiders look different trying to get back into any specific reality but are at the upper Echelon's all connected, they are from before the concept of reality, and we, Humanity, have had those concepts of before existence for quite awhile too, we just have names and identities attached to them. But if those identities are already dead but not forgotten? Outsiders and the need for Oblivion wars...