livb is a good gye. he does trash talk a lot, but its ;part of his metagame. i pm'd liv a couple times a while back and he resppondid back with helpful replies. i really like him as a commentator, my favorite.
Olivier has alot of class, intelligence, and style. I seldom watch televised poker, but was interested in his commentary. I would be surprised if someone could do a better job. You can listen to someone like him or Vanessa speak and realize they are well educated. Alot of the hoodie and headphones crowd don't come across as articulate or knowledgable. Well educated people can generally spot others who are well educated.
I doubt giving away the secrets will matter much. Most of the people watching are losing players and will continue losing regardless of what they are exposed to.