This is my current theory for fnaf lore. Evan is golden Freddy due to their being no victim named Cassidy I have belief that Evan is Fredbear but they scraped Fredbear so Evan is currently only a soul and as we see golden Freddy looked like a golden Freddy for fnaf 2 and 1. (don't say they tried to fix him if they did where is his eyes not the white pupils but the plastic eyes? No so shut up!) So golden Freddy is Evans soul. The person in fnaf 4 is Michael during his teen years having nightmares of the things he used to accidentally kill his brother the machine sounds are there because of the horror of seeing his brother in the hospital.
William Afton got springlocked after he killed charlie a month later. (i have reason to believe that there is a pizzeria between fredbears family dinner and fnaf 2 where charlie got killed that introduced the withered animatronics)
Michael goes to fnaf 2 pizzeria to find William as a night guard. He ends up finding that the souls of every Afton victim the original 5 and after 'before they found Williams rotting suit' possessing the animatronics. He ends up living the sixth night before quiting after not finding William and finds out that after he left they closed due to mangle biting the day guards frontal lobe. And now comes fnaf 1 he returns Survives and leaves because William isn't there. For Fnaf three tho he finds afton but 'the reason afton doesn't jump at the Michael is because he recognized Michael' on his fifth night the pizza place burns down. Michael on one of the in between nights finds where his sister is and goes there after fnaf 3
Everything that happens in fnaf sister location happens the same. For Fnaf pizzeria sim Micheal is the mc and after the burning of the building Michael is sent to the Fazbear frights book the man in room 1280 is Michael. In fnaf ultimate custom night it's not Williams hell it's Michaels because of Evan everything he fears is there his father his sister his brother the animatronics everything is there and it's all caused by Evan afton because he hated how he was murdered.