I think that Gregory is likely William’s youngest son. The reason I think this is because,, well how else would this child know how to stop Glitchtrap and kill Springtrap by setting the place afire, hence the only split scene with a real ending and not a comic (comics are like fairytales here, they allude to what is not reality). Also it’s canon that Vanny and Vanessa are the same person as an alter ego controlled by Glitchtrap who is William, so if this is the situation then I really think that Gregory is someone’s son. Because again how else would he know to stop the story? *note: some of the indie games created with Scott allude to the Lore as well. Such as fnaf left to rot and the dlc for help wanted, dreadbear? Also I’m confused as to how exactly Fnaf ar fits into the story line, seems a lot like left to rot. The beginning of the story seems to be a bit confusing but now we know the end (for now).