I'm not a big fan of the styles of either Santana or BB King. But, that doesn't mean I don't recognize them as being among the elite guitar players of all time. I'm just not going to go out and buy any of their stuff. Same with SRV. Incredible rock/blues guitarist and I really like a few of his songs. But, to me his stuff got very repetitive. Anyone who has ever gotten into Kenny Wayne Shephard knows this guy is a freak with that same style. Saw him open for Van Halen years ago and he never once looked down at his guitar while he was ripping the shit out of it. Dude was about 18 then.
I was going to mention Kenny Wayne Shephard, but there is no need now. Spot on IMO. You have to see him live to appreciate his ability.
I am indifferent about Santana, depends on the mood I am in, but know doubt he is elite. I saw BB and Willie Nelson in concert last year. BB was great in my mind, of course I like the blues. Willie impressed me with his ability as well, I didn't realize that he could pick that well until I saw him live. There is no mistaken that sound from the wore out Martin he plays. I left realizing that I just saw two great string benders. I will never have their ability, I just don't have it in me and I don't play enough. It's been months since I have picked up my guitar. I also haven't see Mark Knopfler mentioned. He is another great player as well.
If you like blues, give McKinley Morganfield (better known as Muddy Waters) a listen. He can flat out play as well.
As far as the video you posted. I consider Clapton one of the best ever and even though I don't like John Mayer, there is no denying his ability and that he is a great player.
EDIT: I think that Zakk Wylde is one hell of a picker as well, you should see him live.