And there's plenty of proof to this case for 1 we haven't heard anything about the CC for five years now and as we saw in the end with the heart moniter going dead and the fact that his head was crushed.
We don't know how long he remained inside of Fredbear's jaw.

Now i'm no doctor but it looks like the back of his head gets crushed which i'm pretty sure is where the spinal cord and nerves are.... So he might end up being paralyzed from this.
Before Fredbear does bite though it looks though the CC squirms the side of his head then gets stuck his head being up-top and face down. The very fact that he ends up in the hospital with an IV bag, meds, and flowers defiantly makes me think he got severe brain damage.

If he was supposedly brought back to life he technically would have severe brain damage/brain dead for the rest of his life or possibly TBI. It wouldn't surprise me if he died in Fredbear's was revived in the hospital and was brain dead when he woke up unable to move or speak. Which I guess explains why on PC the heart moniter goes dead and the plushies disappear. I would think he's dead in Fredbear's jaw from seeing him limp. But if he got revived in the hospital only to die on the fifth night in.

Now moving on from that there are four things I have

1. The Security Logbook
Honestly I don't think It's the CC's here are some pages from the book,

We know the older brother Michael watches this show after his shift is done in Sister Location.

2. Freddy Files

3. Sister Location final ending

[There should be a GIF or video here. Update the app now to see it.]

4. Lets think logically Say one of us or even simply the CC , Would you honestly work in a place that revolved with your biggest fear?

I don't think we would get the job/ The CC wouldn't get the job if he absolutely fears animontronics to the point he's bawling his eyes out, freaking out and running under tables from getting approached. He would get fired and so would we because we're incompetent to that job.

It's like Delilah from 1:35 AM She switched her shift to night time in hopes that she can avoid getting harassed by Ella and sleep all day. Of course that didn't work
and it got so bad with the night shift she was screaming, freaking out,  scaring the customers and her fellow workers.  Because of it she sadly was fired.

When does the CC work in a Freddy's pizzeria? He's way too young to do the nightshift which the logbook states Night1 and so on. He's gonna die in the night shift the instant the animatronics start moving cause he's gonna cry and run under a table.

5. Supposedly while William burned he screamed I hate Mike, I hate Henry!
So I guess he hates his younger son?
Despite the idea that he also likely promised his son he would put him back together.
Honestly we haven't really even seen the CC become one the animatronics or even a shadow yet so i'm starting to think he might not possess anyone.