While listening to an Audiobook of the story, one sentence stuck out to me 'nothing ever happened at Stanley's work' which was odd because the animatronics clearly have tried to escape from the facility.I think that the reason the animatronics don't try to escape during the time he works is that THEY ALREADY HAVE.which would explain why ennard doesn't appear to have the parts of the minirenas of bidibabs because they were left behind and started trying to escape themselves,taking inspiration by ennard and trying to stuff themselves in people,hence the ending of the story.