best non-guitarist, guitar players are..?

Hugely successfull, and terribly untalanted, but has made an impact on the music scene;

The Edge

Walter Becker by the way, is actually quite good, and has
the sense to get someone more capable to do what he cannot.

completely agree w/ Zappa, Prince, Edge (though both Zappa and Prince are certainly technically proficient!)....the others I don't know well

how about also
Joe Walsh
John Butler (check this guy out from down under!...jam band)
Lowell George from Little Feat
Monte Montgomery (if u do not know u gotta check him out: acoustic w/ an attitude)
Peter Frampton (I know, but then again...)
Bonnie Raitt
Tom Petty (when he wants to)
Bruce Springsteen (Bad Lands!)