Some people think that the extra set of teeth in Chica is actually A stuffed dead phone guy. And why people think she is "fat"

But, I think this is wrong. Why? Have you heard of an endoskeleton? Well, those extra set of teeth is part of her endoskeleton teeth. And we don't actually know who killed phone guy and even where his body ended up. Certainly not in Chica. Plus, Bonnie has extra set of teeth too. Actually, all the animatronics do. And in fnaf 2 where withered chica exists, you can see her mouth from the inside. You can see extra teeth and a mouth. But that is part of an endoskeleton.