So, what helps that cupcake is Cassady, is the movie, and other things. In the movie, cupcake is the most agro out of all of the animatronics, and he's the one who starts the spring locks on Williams suit, just like in thee game. And, the reason he can control the others is because there's a piece of him in each like I said before. Another thing about holden Freddy is it is still the crying child, but, he wants to make his father pay for all of the torture and not letting him finally have peace, that makes him changes his look as a ghost, to remind William of his past mistake. More on another post.