ok so all of this hinges on shadow freddy being a remnant/agony monster so like just getting that out of the way- SHADOW FREEDY HAS BEEN ORCISTRATIGHING EVERYTHING FROM BEHIND THE SCEENS POSABLY EVER SENCE SECRET OF THE MIMIC AND I HAVE PROF!!!!!!!! or at lest since the bite of 83 ok so key details

the follow me mini games of fnaf 3: he is helping William just like straight up

fnaf world: all his moves are insta kills and do i even have to mention the whole "i will eat your soul" thing

ok so my theory is shadow freddy was formed from the pain and remnant caused by well the series in general and is an Elanor type figure pulling stirrings from the background to cause more tragedy to give it more remnant to feed on while i think it was just following and helping william pre pizza sim (and also maybe make the fnaf 4 nightmares to feed off mikes pain) afterwards i think he takes a more proactive role i think the reason the mimic and glitch trap are like that is cause shadow freddy used its remnant to mess with their code using the corrupted memory's that he is made of that's why the mci kids keep geting brought back up it's the memory's that shadow freddy is using to influence them and why shodow bonnie has started showing up (i'll get to him later) shadow freddy is trying to make it so the cycle of violence it lives off of continues and it is manipulating everything to make sure of it why do you think mask bot gives cassy the mask it's cause of him needing a new vanny the brazil ending it's all his plan and our protagonists are non the wiser but someone is

enter shadow bonnie: im not sure how he came to be maybe the puppet made him i have a theory that ghosts can make independent entity's but i'll post that later but any way i think shadow bonnie is here to help and more specifically stop shadow freddy i mean just look at happiest day and it even try's to stop you from collecting remnant in ar and i think it isn't alone michel is still alive just look at that room in security breach mike knows about shadow freddy and he and shadow bonnie are working from the shadows as well to try and clean up whats left after the fire and to stop the cycal of pain for good

there is probably more i cloud say but i'll leave it here for now