According to a magazine article I read many years ago, there were contractual difficulties for John Fogerty. Apparently there was no interest in song writing from other band members, so he assumed the responsibility for song writing duties which were not reflected in a fair share of the royalties. Song writing credits on "Mardi Gras" tend to support this when I suppose the end had become inevitable. I cannot recall the magazine or the author and I stand to be corrected.