For what it's worth, https://www.allmusic.com/artist/moon-mullican-mn0000594267/biography says, "Mullican was a star in the world of country music, and may have had more influence there than the sales of his records would lead one to believe. For decades, it was an open secret that he'd co-written "Jambalaya (On the Bayou)" with his fellow Grand Ole Opry member Hank Williams, collecting a 50-percent share of the royalties on the sly because of his contractual relationship to King Records."