When i'm talking about the opening of FNaF, i mean the opening you get when you open the game for the first time. i'm going to analyze it.

The Stage: it's a black void with 2 yellow eyes staring and talking to you. This is most likely the Fredbear Doll from the fnaf 4 ending.

"What happens in the outside effects us here": this is most likely a nod to how the fandom is effecting how Scott does his games.

"You're broken, i can put you back together": this is a quote straight from the FNaF 4 ending. this leads me to believe that this scene is the exact same scene from fnaf 4.