I've detected a pattern with the Fnaf method of storytelling. There's a story thread that seems to lead to a certian plot, but then a new detail comes up that spine everything onto it's head. The second game was presented as a sequel, until the paycheck came dated 1987.
I do think purple guy surviving getting springtrapped is thesable, but that jus begs the question of where that present corpse came from.
We still don't know what the springlock failure incident was. It can't be Fnaf 4's bite, as anyone who's familiar with a mousetrap can tell you. When the spring suit is in animatronic mode, the trap is already closed, and can't fail.
Sister location happens after the closing of a Freddy Fazbear pizzeria, limiting it to taking place after the second game. Prior to Fnaf 2, the location was called the Fazbear family diner.
That wall that hid springtrap, corpse and all, needs to have come from somewhere. The wall was most likely built some time before the first game, meaning SOMEONE had to die with it on before then. The wall is not there in the Fnaf3 mini games, at a time when the building was in a state of disuse and decay.
We started the story in the middle, and still don't know how it all began. The more pieces we get only reveal how many more we've missed. We need to know the beginning.
In my opinion, I no longer think the animatronics were ever haunted. There's nothing supernatural going on. Fnaf is a crossbreed between Polybius and the Terminator.
The different modules the Funtime animatronics had, Freddy's voice mimicry, Foxie's variable scent dispenser, are perfect gaslighting tools.