For this reason I'd give him a low rating on this point. Rita Justice's book is about learning to love the body you have, and her insights about the body seem fresh and even surprising. She gets a high rating here. Mike Knox's book is about street gangs and is very eye-opening. He gets a top score for this first secret.
People like to know they are dealing with authorities.
If a book isn't written by someone with obvious expertise, experience or credentials, it will probably do poorly in the marketplace. Brantley's book is about his beliefs, but he lacks any particular credentials to make him an authority. I'd give his title a low rating here. Rita Justice is a psychologist with over 23 years experience. She's obviously an expert.