Hey, diff'rent strokes for different folks. I simply can't find anything there that would be really exceptional, like grade A, master-world class. Not just technically, I mean also in the general musical "charisma", so to speak.
Yep, I personally like Jerry Garcia, sloppy as he is, much more on his own than the three caballeros. He stands out for me.
So all the adoration h (and the other two) gets there... well, I know half of that is this inner meme on the forum that gets progressively worse with age, the other is probably people who indeed see (some of) the three dudes as exceptional guitarists. I'm fine with that.
And as for the soulfulness - I respect your opinion, but to me soulfulness is... a quality that stands out more in other genres than metal. Also, I tend to conflate it with "juiciness" and I usually find it... well, elsewhere.
Actually, when you say "soulful" and I promised to myself to not babble about the Allmen again, this is what immediately comes to mind:
(that's Eddie Hazel of the Funkadelic fame, in case the video doesn't work for you)
But whatever works for you!