Well, I am glad you haven't suspended him for more than a day at least.
I don't really know why you can't just let him talk and leave him alone. He is going on towards the end of his life, he obviously is very educated, more than most on this site, and he just has some intriguing, and unorthodox ideas he likes to share. If you feel the way he has posted them is a little contrary to your guidelines, well, so what. His posts are no where near as contrary to the rules as what Dr. A posts every day, but you just happen to like him, so you let him do whatever he wants.
I don't think it would kill you to just leave the guy alone and let him talk if he wants. He is not destroying your website, he is adding some entertainment and food for thought. Who is he hurting? He is an old guy who has spent a great deal of his life studying a serious matter. I say have some compassion, let him be.
Edited by Bolder-dash, : No reason given.