I found myself for the first time when I cleared the path. Those lines Glamrock Freddy says while you're descending into the boss fight being this. There's even some lines that kinda make me think Glamrock Freddy is actually possessed by Michael especially when you enter the secret boss battle to fight Burntrap/Afton. resulting in him still wanting to make up for what he did as a teenager and his job won't be done until he makes up for what he did and defeats his father for good. Thus resulting in Michael wanting to redeem himself and you look like the little brother he had once killed. Then on top of that you as the player play as Gregory and Gregory's design is very similar to Crying Child/Evan's.

Like he's the only animatronic that actually wants to help you. So basically people started to come up with this theory because of the way Glamrock Freddy acts. However now I'm heading to more on the side that he is possessed by Michael and here's why

To be honest I didn't believe this theory really but now I don't even know anymore I like believe it but not believe it. To continue publishing, please remove it or upload a different image. Oops! This image does not follow our content guidelines. So basically a popular theory I've seen floating around the fnaf fandom is that Glamrock Freddy is possessed by Michael Afton. So before I start this theory is not entirely mine it's kinda the fandoms theory that I thought I should add.

Fnaf glam rock freddy