Well, a bit of basic research would have uncovered for you that Morris Blythman told more than once in print that he ran a song assembling process that called on various contributors, then gave / shared out name credits to whoever had had the first idea. or had contributed most, or had not had a name credit recently. Morris gave a fine account of how he gently manipulated Matt McGinn into thinking up as new of the key phrase that Morris had already thought of, so that Matt then worked to create much of the verses and lines of a song which Morris then credited to Matt holus bolus.
So T S Law got the credit for the song, but Jim [and others? Morris surely at least] made verses / parts lines.
See?