Responses
If he cut his ear earlier, then he would've gone straight to being food. Since he knew everything, he would most likely escape and tell everyone. The monsters and caretakers don't want this, hence again, they'll make him into food faster. Isabella also checks their ears everyday, so getting away with it would be hard.
also i might be slow or something but if he broke the tracking device all those years ago, then why did he have to cut his ear off later? did they give him a new one? and if so why did he keep it a secret im so confused (╯°Д °)╯╧╧