Mark Knopfler is a big name too.
By the way, which criteria did
you use, because it's
your greatest list, not just "
a greatest list"?
Personally, I have some trouble with putting Benson in a top ten. I know he was (ans still is) successful but when it comes to playing, Grant Green was one of his bigger heroes.
About Grant Green:
"A severely underrated player during his lifetime, Grant Green is one of the great unsung heroes of jazz guitar ... Green's playing is immediately recognizable -- perhaps more than any other guitarist."
Because of that typical own style, indeed more recognizable than any other guitarist, I have put him high on my list. More info
here.
So when it comes to sales as a criterium only, then indeed Benson (who made a lot of money with his commercial vocal work as well) should be higher on the list.
But when it comes to style, I'd prefer other axemen.
Charlie Christian and Wes Montgomery are other huge names in jazz, and there are more of course.
To be honest, we can rationalize this as much as we want, but in the end it again comes down to
taste for guitarists (and knowledge about them).