Mgod makes a point I have always believed to be true, and two examples that prove his theory are the april fools show where they all switched instruments and the noises coming from Jerry's axe by Mickey were horrible. Also Melkweg when they played on borrowed instruments and amps, none of which had all the low Z, pedals, bobby's enless rack, etc... and they sounded like the dead. And I think Jerry can sound like jerry more than some of the best jerry musical impersonators through a crate after he tweaked the knobs to his liking. hell he sounded like Jerry in the late 90's through a mixing board right? icepicks and all.
Waldo is right too if I understand what he is trying to say, and I understand what he is saying by what I think he means by his definitions of the words or what he means by saying them.
Hogan also makes a huge point too because tone and technique changes too with everyone in the band over time. But there is something that is just timeless with each of them in terms of their playing. I was at my sons football practice listening to my ipod, switching from 1969 to '74 to '77 to 82 to 92 to 94 to 95 and noticed the broad tonal differences, but they had a consistent technique that is identifiable individually, maybe a foundation is a better term. BUT, Bobby did change some things drastically across the board over the years, especially in the late 80's and 90's technically and tonally. Jerry seems to evolve too technically, playing riffs a little different and adding new solo material/licks but still had his signature approach and stuff too. All in all they still had that core that was the foundation to themselves but were always looking to do things a little different with what they knew for the sake of their philosophy and musical approach as a band that never played the same song the same way. if that makes sense.

Just a little stand up philosophy for the hell of it!