I think my FIL has NPD. Converted to JWs at 21, made an elder in his twenties, congregation overseer in his thirties. Ran departments at Twickenham convention. Was determined to be a circuit overseer even though he had two small kids. They kept telling him no. No education to speak of, he even missed a lot of primary school during WWII. Manual worker, his wife did his accounts.
I'm not a psychiatrist but I do wonder if someone with a genetic dIsposition to the disorder is damaged by being given positions with a huge amount of power over people's lives by this cult. Especially when they've not had to work their way through education which grounds people I believe to a certain extent. He always thought he'd beat the system, that he was blessed. He was looked up to by so many people yet disliked by other elders because he couldn't stop telling them what to do.
Even now after he's been out years he thinks he's lucky and you don't have to work hard, you have to manipulate people into doing what you want. He got someone to lie about him having a bachelors degree and had them write a letter of recommendation so he could get on an MBA program.
He wrote these atrocious essays that his tutor sent back again and again and let him rewrite them! He couldn't get through the pass mark on the essays which was only 40%. Somehow he got his tutor to explain what he needed to write and mark them over and over until he got it right. Got an MBA without having a first degree through lying and manipulating people. Then got a lecturer's job but couldn't hack it and retired. He said at his first lecture he was amazed the students didn't clap.
I keep away from him as much as possible. He damaged his kids severely. His wife runs around after him like a skivvy and he talks to her as if she's stupid. I don't need need toxic people in my life any more. He knows everything anyway, why would he need me around, except to applaud his genius.