A theory that refers to one of the endings where Vanny dies and then Vanessa is seen watching.
Before seeing this ending I thought that Vanny was Vanessa (the night watchman), but now I think there are 2 Vanesse the same, but from another universe, because they come from two different games (Help Wanted and Security Breach).
My second Theory refers to the Endo, who in my opinion are the old animatronics of the old restaurant that is located under the mega pizza plex (which I believe is the restaurant of FNaF 6 where it turns out that Afton and Molten Freddy are still alive)
Sorry if I misspelled the file but I had to hurry!

-TheeLdU0z5