I think Dylan chooses to sing as he does. His Nashville Skyline album proves he doesn’t have to.
@bdp24 , going back to a few posts that I made ago, I remember once reading that Bob Dylan’s style of vocal work came from trying to imitate Woody Guthrie. +1 on Nashville Skyline, and I personally feel that applies even more to Blood On The Tracks, as that LP proves that Bob Dylan could sing.