A FNAF & Gravity Falls theory

Bill Cipher is Golden Freddy

Bill was a normal child once. He went to Freddy Fazbear's Pizza with four friends when they were little. Purple Guy killed them all and put them in the suits. Bill got stuck inside the Golden Freddy suit. His soul somehow escaped and he turned into the Dorito-like dream demon we know today. How did that happen? Maybe the suit had some special power related to Gravity Falls.

It was never stated when exactly Purple Guy killed those kids. My guess is it happened before the Bite of '87,  and Bill somehow got transported to Gravity Falls. He later met the Author and well, we all know the story from there. Remember, Five Nights at Freddy's 2 happened in 1987. The animatronics were already haunted. Who knows how long they'd been that way? It would've been over five years before FNAF 2, aka 1981 at the latest. Bill would've needed time to meet the Author and everything. His ultimate goal may very well be to become human again and find his friends.

Bill Cipher's personality may be another clue. He's very childish despite how old he seems, yet he's also described as insane by Gideon Gleeful. If Bill was the fifth child, he would've died at a young age, explaining his childish demeanor. Thinking about what happened to him and his friends and not knowing when he'll see them again would've driven him to insanity.

Also, most human Bill Cipher drawings depict him as a tall, slim blonde with an eyepatch and wearing a yellow tailcoat that has a brick design. He also wears a top hat and typically a bow tie, which is what Golden Freddy seems to have. Physical similarities: Coincidence? Think about it.

See any flaws? Tell me. I want to know.

Thanks for reading!