For me it has to be Mr Gilbert from that list. As you say though, there are so many to choose from. For my money the best guitar player I have ever seen was the guy I played in a covers band with for a decade - Andy Draper. He was the most accomplished musician I have ever encountered. He could play anything back to you after hearing it only once. A modest chap who now doesn't play at all, shame.
As for the best I've ever seen was Mark Owers of Lionsheart, replaced by a former band mate of mine, Nick Burr, two shows into their first tour. Nick was bl**dy good too, mind you. Had a brother called Tim - a bit of a lapse in concentration by mum and dad. But I digress (no change there then . . . )