If you read the criteria for winning a Nobel Prize, Dylan fits it perfectly. Him putting his words into music is the icing on the cake that makes the totallity of his impact even more obvious. Being a musician brought his wordws to more people than it would otherwise I would say though. Perhaps an unfair advantage, but certainly not against the rules. Maybe other Nobel hopefuls should learn to play a guitar or piano.
If you read up on Dylan, nobody will say he is a great musician or a great vocalist. What he is is a great artist with more tools than most, although he has also demonstrated his dedication to what he does by touring almost contantly over the years and continuing to produce music that is appealing. He learned to hire other good musicians and use them in his band to help convey his message, which changes at his whim.
The facts speak for themself. He is brilliant, a genius, a machine,totally deserving of any accolade given him. He knows how to make things work when it comes to delivering his message to his audience which only continues to grow as the years pass. He is also the gold standard by which many an aspiring musician has been compared to over the years and that many aspire to be able to equal or exceed.