Dunno. He has had fans for a while. If you went back fifteen years in our ward, you would get some people who "cleaved unto" (cleft?) Bednar and then some who were Boyd K. Packer fans. You would see one or the other quoted on the back of baptismal programmes etc.
I never really got anything out of Bednar. He was a bore. Packer was a bit too authoritarian for my liking. As for Gong, I've never paid any attention to him in the first place.