MK has "a way with words". There is not one formula to write prose and one to write in a journalistic style. I have no doubt that MK could write something that would be a good read. His accurate and pedantic character never shines more than in every single word of his lyrics. It's awesome and there is a lot of work and thought in every syllable. It's just that you need to dive deeper into characters, times and places to make it good literature, let alone a proper novel. Songs are miniatures, much smaller and shorter than any short story and cannot be divided from and judged without the musical level. It's a question of energy and devotion that it needs to dive into a novel's world, not one of skills when it comes to MK.
A work like John's would be no problem for MK to write. It would be better than anything from a paid journalist or ghost writer.
In my personal opinion, MK's lyric writing is more unique and more outstanding than his guitar playing. Many of his lyrics stand the test with poetry.
LE