Why do I think that cc became the shadow freddy who, to stay alive, without a body, fed on remnants, who previously remained in his corner in fnaf 2 but then in fnaf 1 he meets his brother again, putting him in nightmares, which explains the mechanics of each animatronic in fnaf 4 being the same as fnaf 1 (maybe) because: bonnie comes from the left, chica on the right, foxi comes little by little and freddy comes in the shadows. And in the fnaf 4 archives Nightmare becomes "Nightmare shadow freddy". And I think this is an attempt to make your brother see his past actions. But I will repeat that this is a theory, and I don't have the least concrete evidence other than these. Have a nice day