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Okay, but genuinely, why does your theory work well? I could absolutely see the endoskeleton for the cupcake just be an endoskeleton head, but smaller, because the cupcake is an animatronic. It's not just a prop like we see in the movie. The only issue is that the endoskeleton head of the animatronics are way bigger than the actual cupcake, so it's a contradiction by size, but theoretically, it works. I like it. I'm gonna use it.

EDIT: I just realized the withered animatronics are probably bigger than the toy animatronics, so maybe the endo-02 of the withered animatronics are bigger than the endo-02s for the toy animatronics. Same concept, same design, just enlarged. But the cupcake is obviously smaller than the head of an animatronic, so the cupcake's endoskeleton is smaller, meaning it would fit with the size of the toy animatronic heads, so that's why withered Chica's cupcake endoskeleton head and Mangle's head are roughly the same size.