The fact that cool doctrines didn't come from the Church until educated people joined the Mormon church leads you to believe that Joseph Smith might not have been the author of these doctrines

Reasons to disagree

1. Its a nice idea, but no one came forward and said, Joseph Smith's ideas about the pre-mortal existence, baptisms for the dead, the quorum of the 12 apostles, or anything else, really came from them, did they?