I had a conversation by mail years ago, when MK was about to open his studio, with Chuck Ainlay and he told me that most of MK best songs, usually rockers, were left out of his records because he wanted to have balance on his records, despite leaving out some of the best.
He also told me that he hoped that having a studio of his own and all his time to play there, maybe he would rescue some of that rockers.
Now we know he didn't, he just turned into a folkie songwriter.