Warning: This post includes spoilers from the movies "Inception" and "Coraline". If you haven't watched those movies and don't want any spoilers, don't read this.
So, let's start the theory.
This theory basically shows the evidences that Dipper, Mabel, Soos and Wendy never managed to left the bubble during the weirdmageddon.
How do you understand that you're dreaming? Probably because there are some stuff against laws of biology and physics. For an example, if you have wings, you're either dreaming or hallucinating. Even with lucid dreaming it is advised to check some stuff so you don't confuse the dream with reality. Inside the bubble, Mabel knows the stuff around her isn't 'real' because there are flying sweaters etc., and she can do probably whatever she wants with clapping her hands. When she 'pops it up' her powers doesn't exist anymore so it's reasonable for them to assume they are in the outside world now. Just like the button eyes of the movie Coraline. But since it is Bill who gave her that power, he can take it back just as easily. And why wouldn't he? This way, he could have them all in a cage, when they don't even know that! Bill says that Mabelland is 'one of the most clever traps he's ever made.' If we assume that this theory is true, then we can agree with Bill. Because if it is true, Mabelland is like an intelligent dream that keeps you asleep by making you think you woke up. Plus, do I need to mention that Bill Cipher is literally labeled as a DREAM DEMON, which means he has a better understanding of our minds and dreams better than anyone else!?
If you have watched the movie "Inception" you probably remember one of the most important rules of creating a dream. 'Do not use places from the real world, otherwise you may confuse dreams with reality.' I don't mean the Shack or town in general here, because they already should have been there if Bill wants to make Mabel think she is outside. However, Mabelland also answers Mabel's memories and creativity. With these two pictures, you can have a better understanding of what I mean.
As you see, the shape and locations of trees are almost identical. If we assume these are the same place, still something is not right. Because Mabel ran away from the Shack and couldn't go as far as somewhere near town. In the show, we see the Fearamid rises from somewhere near the town center, because this is where Bill was and it was almost right behind him, and the Pines family was inside it when Bill is 'erased'. (I'll come to that later.) Which means, it is nearly impossible for them to be near the Shack at that moment.
Now let's look at some characters's attitudes before and after the bubble.
I mean, after Weirdmageddon, he himself says that he can control time and space now, and proves it by changing Ford's location immediately. So this might be an irrelevant thought but why did he chase after the twins? He could have just snapped his fingers and they would be there? Another thing about Bill is of course Stanley's memories coming back. Because if they're in the bubble, that Stanley is probably not even the real one. The last thing is, of course, how the heck he didn't see the fingers? Stanley in Ford's clothes was wearing gloves so it's understandable but Ford made no attempt to hide his hands so, how?
About him, there are two main topics I want to talk about. First one is his face and attitude towards Bill.
In the first picture, he offers Bill his service and has his face 'fixed' according to Bill. After the bubble, his face is somehow normal and more importantly, he, the man who doesn't even talk anyone who is not a millionaire, (and is an asshole) supports Pacifica to hold McGucket's hand. I have a feeling that he would rather death than doing so. Besides, after Weirdmageddon, we see him giving all his money to rebuild of the town, which is again, something he would rather die than to do so.
This is not exactly a before after thing but there is something suspicious. In the episode 'Dreamscapers', we see Stan's mind as a labyrinth of doors and memories but when Bill enters there at the finale, there is only one door which means either he is really good at 'clearing his mind' as Bill said, or Ford erased rest of his memories before Bill came back. The second one doesn't make sense that much because that way since he doesn't have many of his memories, Stanley might have ruined the plan. But unlike Ford, Stanley doesn't really understand how minds and memories work, at least not as good as Ford and Bill, and probably Fiddleford. So if they are still in the bubble, it would make more sense. You may think that Mabel didn't know there were such a plan so the bubble wouldn't do that, but it is Bill who is the one really in control there. So if he would want to fake his dead or something like that, Mabel wouldn't know that.
Okay, now let's look at some events that are pretty odd.
The memory gun is first in Soos's bag, but without any other scene we see it move, it is somehow in Ford's lab coat.
It is also possible that there more than one of those memory guns, but as far as we know, there is no other. Plus, even if there was another in his lab coat, it probably would have crushed during Ford's torment by Bill.
This is pretty irrelevant but how did Gideon know that the statutes would turn back to normal if they hold Mayor Taylor. Why would Bill tell him (or anyone else, in case he might've overheard) this?
That 'Dream Boys' of Mabel was still out there even after the bubble was destroyed. You may think this is because they were created by Bill, in a way, so they were a part of the weirdness, but the next title may change your mind.
We have never seen Waddles entering the bubble, and he couldn't have had before Dipper, Wendy and Soos because it was locked. But he was inside the bubble when they were, and he escaped to the outside with them. Plus, he was inside the Shacktron, where no weirdness of Bill can enter. How?
If you still think this may have something to do with Bill's anomalies, I need to show you this picture, which proves something from the "Nightmare Realm" can still stay after the Weirdmageddon. But according to Ford, everything that came with Bill was supposed to be gone?
Also, I need to add that everything, literally everything after the Weirdmageddon happened the way exactly Mabel would like them to have. Dipper came with her to Piedmont, Candy and Grenda stayed at her birthday even though they said they couldn't have, well, maybe Stan letting her to use the Shack to party would eventually happen but again, Preston giving/losing his money, Pacifica and Gideon trying to be normal children. For the last thing, Soos was inside the bubble with them, we know one of the things Soos wants the most is being mr. Mystery one day and he gets it. Just a little too much coincidence, in my opinion
Now here is why this theory is probably one of the creepiest theories of Gravity Falls. First of all, there is no way to prove if someone can actually manage to get out of the bubble or not once they get in, just like the famous "what if Coraline never left the other world" theory.
Second, if they've never got out of the bubble, this means everyone in the town, and maybe even in the world, might be dead, if Ford gave him the equation. If not, Bill probably kept torturing him until he died, but since he can control time, he can raise him until forever!
This theory had been long enough so I'm leaving it here. If you have any opinion about all those, feel free to write them please.
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