It’s not bad but I was never a fan of merging the three for obvious reasons. Firstly, the “Presence” rarely ever mention by name especially how he’s treated within different canons:
Grant Morrison work on JLA confirms he’s more akin to just a creator entity rather than anything. Even if we discount JLA, we still could consider Final Crisis: Revelations where he is mentioned to be the creator of Heaven and Earth ie Creation ex nihilo and which the Lucifer series also attested with the same claim that God created everything from the Void, so that would be more akin to Creation ex deo which doesn’t even line up. He created Creation out of “himself?” The Overvoid was meant to be the “God” of his Cosmology with the Source being akin to it. This bars another problem.
In Snyder Cosmology, the Void isn’t a sentient cosmic mind with the Multiverse growing. Rather, just an endless expanse of space that teems with life. Apparently, you can “rent from it” ie Perpetua, be beyond it ie the Banks of Creation, and a hierarchy existing in it ie Unseen Council. So, it’s just a “corrosive” force of nature beyond material Creation, nothing like Morrison idea of a supreme Void that can be called God from which Creation is nothing but infinitesimal to it. This comes another problem.
Snyder treated the Overvoid as just some regular Void nothing special to it, and Williamson makes it more complicated. Apparently, the Overvoid isn’t eternal or the first very thing, apparently the Darkness precedes it and the non-dual Void apparently is “Light” akin to “Darkness.” Which makes no sense in the context of Morrison. This also makes no sense since the “Source” came from the Dark. According to Snyder, the Source was supreme and eternal. That the Presence was a personal manifestation, more so an emanation of it, that nothing exists outside the Source, in any way. Thorne literally claims the Source produce the Darkness despite the story kind depicting a different story, and Snyder claim can’t be correct that the Source is “supreme” if it’s matched.
Then you got the obvious caveat: the Presence. The Presence has always taken aspect and manifestation. In JSA, apparently the Darkness treated into the Shadowlands, the same “primordial shadow” the exact description of the Darkness when the Presence said “let there be light” as Incarnate apparently told us the Light grew from being imperceptible in the Darkness as it’s mentioned the Light was created, not naturally formed. Now, you may question “when did the comics mention this?” Obviously, JSA did but let’s pretend it didn’t. I talked to Imaginary Axis(who follows me on Twitter and we had some chat). Apparently, he never asked and it’s never been directly stated in the comics but the Hands were created by the Source, as something don't need a direct explanation. Which comes to my next point, in the DC Greatest Events, it was claimed that the Presence is the fountainhead that exists beyond the Source. In Swamp Thing #75 God exist beyond all opposite and created the Light and Darkness as nothing more than just dualistic concepts in the Marcoverse as there are things beyond the two, even more fundamental, and that same God exist beyond all those levels where he is one with the Void, eternal and living in quintessenal perfection that gave birth to all things.
So, I never liked the “theory” because Morrison never claimed that “God” was even the Presence. His story never supported it, he was giving analogies of different names to the Overvoid, which in several interview he call God which can be interchangeable with “Void” and not the Presence.
Snyder denotes the Overvoid as just some space, not sentient, not God, not anything but just lacking material. Williamson apparently believes that the Darkness is the eternal Void, and the Overvoid is nothing but the hue of perfect light. The Presence has never been mentioned directly other than a Doomsday Special which they call him “God.” Yeah, so there’s so much mess between interpretation.
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@Elizio33 mentioned earlier. I see the Presence as sitting at the top, at least in his most purest form. With the Source being the source of creative potential that divinity and embodies all life. The Overvoid as just an endless space from which the Multiverses comes about and could be used interchangeably with newer terms like Greater Omniverse or the “Infinite.” The Darkness being the eternal background from which all things comes from. I, personally, think they should all just have different profile with different abilities based on what was seen, not some fan theories claiming they’re the same thing because the stories don’t line with it.
Plus, ask yourself this, how many stories was told of the Presence creating the “Light.” The Light that became Creation and is embodied Creation. That logically makes no sense and that doesn’t sit right with me and the amount of indirect and direct statement that has been made that “God made the light.” DC editorial literally claim they mainly treat the Presence as would the Judeo-Christian view and those literally put him as maker of the “Light.” Yeah, he can shine as bright as the concept of Light, itself, but making him bound to duality is something that I don’t think any writer intended. Morrison never intended Overvoid to be dual, Snyder never intended the Source to be dual, etc…