Lol, ok since i posted about how i thought fredbear did bite of 87 over phone guys transcripts, well i made a mistake lmao, i forgot about the timeline and a dude told me, groovygravyaltalt i think, about how fredbear was closed by then, which is true, since the timeline i suddenly just remembered was like fredbears and friends, then the fnaf 2 place, and so on...
Now serious talk about '87, although it is not yet confirmed, i suspect mangle is a good idea for why, after all, she has a damaged jaw which gives a good idea of how she fit a grown man's frontal lobe in that jaw. Otherwise you can say it was another toy animatronic since by night 5 or 6, phone guy's transcript shows how the toys facial recognition was messed with and a spare suit was stolen, presumably a yellow one suit. You might think this has nothing to do with the bite of '87, but trust me, it sounds like afton was the reason behind '87