Interesting, chaim!
I had a feeling it was Don but one can never be sure.
I personally still believe the fast licks in the James Dean intro are Don, but one of these days I'll ask him. It was either him or Glenn, IMO. That fast rock thing is just not in Bernie's repertoire. Could he do it if asked, I'm sure, but it's not in the vocabulary I've seen him use as a player. He's more of a country guy. I never heard Bernie use very overdriven tones either, other than maybe the rhythm and intro on Witchy Woman when he used a Les Paul Deluxe. To me it sounds straight up west coast blackface/silverface 60s Fender type of sound. Very clean and steel-y. Not much grit on most of his iconic parts to my ears anyway. At California Jam 1974, Felder was absent and those licks I'm talking about weren't played. There is live footage of Felder playing those exact licks during the HC tour. Hmm.