Frankly, guys, of all the major media industry awards, the Grammys are the worst. They have the least credibility, IMHO, of any of them. They do not reward good music, they reward strong-selling music.
This is not meant at all to besmirch Zevon winning one, although I have a feeling that Zevon wouldnt' give a shit about it. But it's often the case that artists win after their deaths...John Lennon's DOUBLE FANTASY won Album Of The Year following Lennon's death. No way that album gets a hint of a Grammy nom had Lennon not been gunned down.
To my knowledge, the Stones have never won a Grammy. Townshend and the Who have never even been nominated (although Townshend has a Tony win and an Oscar nomination)
The Grammys are crap. Pay them no attention.