"greatest" is apparently a combination of ability, influence and popularity.
Someone like Holdsworth is so original and plays such difficult passages it would be very difficult for him to have more "influence".
I'm with Hot Hard Cash that the jazz guys are underrepresented especially for ability and technique but of course jazz is less popular even though many of the jazz players were hugely influential (example: Dimeola influenced Yngwie who started a whole brand of guitar playing though it didn't last long).
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