I predict that William will be a back as Springtrap but he won’t be alone. The first movie had a lot of similarities with The Silver Eyes so I think the second movie will share similarities with The Twisted Ones, so Springtrap is the main antagonist and is backed by a team of other animatronics (though the stakes will be higher this time since the Toy animatronics are there too). So who will the other animatronics be I predict they will be the spare animatronics possessed by the people who were stuffed in them. This actually makes sense even from a logical situation, Afton has been springlocked and lost all of his minions and there conveniently are 3 souls freshly possessing animatronics, their confused, probably scared, and probably wanting revenge, perfect targets for manipulation. Though I think Max/Shadow Freddy will probably end up siding with the protagonists in the end.
The classic animatronics will be back as well now withered and no longer threats since they have no reason to be aggressive towards the main characters anymore. This is also similar to the Twisted Ones, like the Twisted Ones they would also probably have some sort of fight scene with the villains. Because of their role in the story they’d probably show up towards the 3 act.
The movie will probably end with a fire.
So what do you think?