So we all know the confusing game that is Fnaf 4, Right? and how it is probably associated with Midnight Moderist? Well I have a theory that I think cracks the case of Fnaf 4 AND Midnight Moderist. I haven't seen this theory anywhere else, so this will be the only instance to the best of my knowledge.

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Midnight Moderist

So in Midnight Moderist you play as "Mustard Man" driving in a suspiciously purple car in the rain. he gets home and talks to an unknown person that is not only wearing gray, and speaks in gray as well. they tell you to leave "Him" alone. you never the less knock on his door, demanding to be let in. when that doesn't work, you go around to the back of the house to find a broken window, human footprints leading away from the site, and animal footprints standing just outside. You say "Ran off to that place again. He'll be sorry when he gets Back." and the screen cuts to black.

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The Characters

so we can already label "Mustard Man" as William Afton. He drives a purple car, the minigame is labeled in the files as "Later that night" and it is raining, just like the Security Puppet minigame, which shows Charlie Emily's death. with that out of the way, let's talk about about the gray person. this person is most definitely Michael, or "Foxy Bro" watching the TV, just like Michael does at the end of each night in Sister Location. he is also wearing a gray shirt, like Foxy Bro is in Fnaf 4, and he speaks in gray, like Foxy Bro. Now if he is Michael/Foxy Bro, then the "He" he mentions is most likely the Crying Child(CC).

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So, What Happened?

Well, William is shown in the Minigame driving home after his first murder, and when he gets home, CC has run away to "That Place" most likely Fredbear's Family Diner since that was where William just was. If CC went to Fredbear's, then wouldn't he be there when his father murdered Charlie? and when The Puppet went outside after Charlie? what if CC saw Charlie outside in the rain, and saw The Puppet go outside too. He would then go out as well, and what would he find? an animatronic laying on top of a child's corpse. It all makes sense now. CC saw The Puppet on top of Charlie and believed that The Puppet killed her. "what is seen in the shadows is easily misunderstood in the mind of a child." now that explains CC's fear of animatronics, and what the Fredbear plush meant when he said "You know what will happen if he catches you." Michael, now aware of his brother's new found fear, would begin to bully him about his fear. Why? Well in Security Breach's CD's one of the backstories provided was that Vanessa's father, Bill, forced her to lie about her mother in court to win the custody battle. in the aftermath, it is implied her mother K*lled herself. this story turns out to be a complete fabrication. but look at Bill's name. it is short for William. this story is not Vanessa's but of the Afton kids. in the aftermath of this traumatic divorce, Michael would express his sadness by torturing his younger brother using animatronic masks. this is backed up in the story "Step Closer" where the protagonist, Pete, shares striking similarities to Michael. In this story, it is said Pete bullied his younger brother to express his sadness over his parent's divorce.

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So What is Fnaf 4?

This is where the fun begins. So before we talk about Fnaf 4, I should mention the dirt mound and the animal footprints. In the Twisted Ones, the Twisted animatronics seem to be the counterparts to the Nightmare animatronics. For that reason, I think it is safe to assume that the dirt mound is where at least one of the animatronics bury themselves during the day, like in the Twisted Ones novel, and the animal footprints are from one of the Nightmare animatronics. They would be stalking the house, like seen in the menu screen of Fnaf 4. So, to lead our way to Fnaf 4, I would like to turn your attention to William's line of "He'll be sorry when he gets back." since his kid not only snuck out of the house, but went to Fredbear's on a night he killed someone. as punishment, William locked CC in one of his "Observatory" rooms seen in Sister Location, and would send the Nightmare Animatronics after him. since the Nightmare animatronics are counterparts to the Twisted Ones, then it is not far-fetched to assume they are just bare endoskeletons with a sound-illusion disc on, people see terrifying versions of Freddy, Bonnie, Chica, Foxy, and Fredbear.(note that I am going with the idea that Nightmare is Nightmare Fredbear with a malfunctioning illusion disc, like MatPat pointed out) William also put a camera and Walkie-Talkie in CC's favorite toy, Fredbear. too keep an eye on him. in the bedroom we can also see easter-eggs showing a vase of flowers, pills, and an IV. these might be caused by the illusion discs, forcing CC to see reference's to his mother on her deathbed. Nights 1-5 go along with the end of night minigames, leading up to CC's birthday party at his now-least-favorite place, Fredbear's Family Diner. It is on that day, though, that Michael and his friends will take things too far. They pick-up CC, carry him over to Fredbear, and stuff his head inside. They all have a good laugh at CC's expense, when Fredbear's jaw slams shut, hospitalizing CC in the Bite of '83. we also see in the night 6 end-of-night minigame CC pass on, while Michael apologizes and William tells CC"I will put you back together" before it is implies CC passes away. Michael's story continues in The Survival Logbook, where he draws an image of Nightmare Fredbear or Nightmare. how would he know these animatronics exist? Nights 6-8 are when you play as Michael, trapped in the same room CC was in as punishment handed out by William for killing his brother. The box, therefore, could refer to Michael's repressed memories of the incident which killed his brother.

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Tying It All together

The story of Fnaf 4, I believe, is this: William has just taken a life. he drives back home in the dead of night, and checks on his youngest son, CC, for having his door closed. He goes around the back to find CC has broken out of his room, along with evidence of his Nightmare Animatronics on the prowl. William realizes CC ran off the Fredbear's Family Diner, where he had just killed a child. turns out, CC saw the girl in the ally, and The Puppet go outside with her. after following them, he finds a grizzly scene: The Puppet on-top of the freshly murdered corpse of the girl, Charlie. CC sees that the animatronics are actually bloodthirsty murderers who kill kids. he runs back home. the next day, his Fredbear Plush begins talking to him. William then places CC in his Observatory room, where he uses the Nightmare animatronics to punish his son for disobeying him. CC's older brother, Michael, also begins to torture him, using his new-found fear against him. It seems the whole world was against him. but tragedy would strike on his birthday at Fredbear's, where Michael and his friend's all pick-up CC, and shove him into Fredbear's mouth as a sick prank. it would be then that CC would be put into a coma in the event that would come to be known as "The Bite of '83". in the hospital, Michael would apologize for what he did, while William promises to put CC back together. CC then dies in the hospital. as punishment for killing his son, William would put Michael into the Observatory where CC once was, where he would be tortured by the Nightmare animatronics, events that would continue to haunt him for decades after that.