OK, let me put it to you this way.
Cash and Stewart could/can carry a tune AND you can understand them when they sing.
I have yet to find a Dylan song where what he’s saying is 100% clear. Most of it sounds like “bleh bleah blah BLAH!”
In his 60s and 70s prime you can understand everything.
Actually, many of my favorite 'Dylan' songs are those performed by others.
Johnny Cash with 'Wanted Man', Hendrix with 'Watchtower', the Byrds with several.
Dylan's greatness is certainly not his vocal skills (or lack there of)
Check out Cash's rendition (w/Bob Dylan, of all people) of Girl from the North Country (on Nashville Skyline) if you're so confident he can carry a tune.
And Rod Stewart? Gay.
You can understand American Idol singers plainly, and guess what? They all suck.
I have yet to find a Dylan song where what he’s saying is 100% clear. Most of it sounds like “bleh bleah blah BLAH!”
_____
I think you’ve finally outed yourself as someone who really hasn’t listened to much Dylan. Your continued harping on ‘he can’t sing’ just sounds like so much of the boilerplate criticism we hear about him routinely. Nasal voice? You betcha. Imcomprehensible? That’s just silly.
Go download a few tunes from Blood on the Tracks, or even Blond on Blond. If you can’t make out what he’s saying on ‘To Johanna’, or ‘Shelter from the Storm’ or even ‘Lilly Rosemary and the Jack of Hearts’, you aren’t trying.