So my theory is that the good ending happened after FNAF 1. To support my theory I willl include hard proof and evidance. So after the fianl security guard gets fired from Freddy Fazbear's Pizza as it says on the check, Odor, Tampering with the Animatronics and general unprofession, the place gets shut down for good for still unknown reasons. but as the place gets shutdown the souls of the animatronics are freed because there is no more Security Guard to anger them. Their unfinished buissness is settled. Now heres why they were still possessing the Animatronics. When the Purple guy (Phone guy) killed them and the puppet stuffed them in the suits, Purple guy (Phone Guy) is the security guard and thats what they know. Any time they see a person wearing that security guard outfit they automatically asume its the man who killed them since it was a glimpse of what the Purple guy was wearing. Remember these are still children's souls that are possessing these animatronics. So even though that the purple guy died after the closing of the 87 pizzaria but happened before the opening of the FNAF1 Pizzaria
Hope you enjoyed my theory if you did tell me about it below
Cya :)