People often speak out of ignorance. For instance, I read your post where you say:

The fact that he only uses pentatonic scales throughout the solo (and literally every one I've EVER heard him do...) implies that he wouldn't be able to play through even a basic jazz tune. Jazz is really fricken tough: changing keys, altered 7ths, substitutions, etc. He'd be totally out of his element--as would Clapton, Hendrix, SRV, and all the other "greats."

And I note that you put the word "greats" in quotes, implying that they aren't great, because they aren't jazz players. And that pissed me off and sounded incredibly arrogant, because it was in fact incredibly arrogant.

I am quite certain that any of those guys could play Autumn Leaves. It isn't rocket science.

I would also add that yes, blues players do use those pentatonic scales you are so dismissive of. Except of course we mix both major and minor with the b5, so we are working with 9 notes, which is actually 2 more than your typical diatonic scale. We also play Mixolydian a lot. And Dorian. And half whole diminished, and m7b5 arpeggios. And Lydian dominant. And occasionally Phrygian dominant to get that groovy wide interval. Some jazz players utilize pentatonic scales extensively, like Scott Henderson, who will start a minor shape off of the 3rd or 5th, lending different extension flavors.

Also, I'd wager that not one of the players in that thread you linked to about SRV could play a Blind Blake finger style ragtime tune to save their lives. Or Willie Brown. Or really blues in general.

Jazz may not get its due, but the blues gets shat on from all sides: shredders who think it's "easy", and jazz guys who think it's "easy" and both sides offer the same inane argument -- "they play the pentatonic". When I hear jazz, I hear "arpeggio up, scale down", like the Mixolydian with the major 7 added, not for musical purposes mind you, but just so there is an even number of notes so you can play a steady stream of unadorned 8th notes like a typewriter. I have great respect for the idiom, and enjoy jazz just as much as anyone, but the elitist attitude is a massive turn off.

The reason you don't see jazz players on those lists is that at some point jazz stopped being popular music and became "art", so us philistines all became outsiders.