No Johnny was not a JW but he studied with various ones in my old hall for some years, and we all joined him when he was in town for concerts. He ended up buying a home in our territory and we went over many times for gatherings.
I have very fond memories of Johnny. One of my favorites is we were sitting around chatting and one of my "former" friends said, "Johnny, who is Mabel?" (One of his songs.) Johnny: "Everybody's got a Mabel." lol
Edited to add Larry Graham had nothing at all to do with this. There is a story but it's not mine to tell.