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People have been fighting over who's who and what's canon and stuff for literally forever, and FNaF and it's lore has grown so much over the past 10 years, that its gotten to the point where my personal headcanon/belief is that there's multiple timelines for the same story now.
Think of it like a train route map. For example, UCN would be a station, and there's two timelines(or routes) branching off of it.
Theres one timeline where Andrew does exist, which means he's TOYSNHK, the books are canon, and Cassidy is probably a girl, and there another timeline where Andrew doesn't exist, which means the books probably aren't canon (unless my 'Andrew ans Cassidy are the same person' joke theory turns out to be true somehow) and Cassidy is TOYSNHK, which meas Cassdy is probably a boy.
Is this Canon? Eh, probably not. Obviously, FNaF already has different timelines and stuff with the Silver Eyes and Movie(s), but it's how I like to rationalize any inconsistencies and randomly changing lore in the games, too.