You cannot have a “disorder” and get involved with Mormonism without that affecting and creating a worse situation. It’s well known Beck wasn’t the most stable guy in the field, but he did get the help needed and thus shook that off and became the success he was....but then Mormonism grabbed his shirt tail and things went down hill from there.
His detachment from reality seemed to occur when he began build his huge organization in Texas with his ego growing ever bigger. I truly think his ego just got out of control and pride does come before the fall. Unfortunately his fall has been into mental instability.