Personally, I think Jimmy's injuries to his fretting fingers played a major factor and should be taken into consideration. It literally forced him to change his style/technique, especially in '75. And, I'm quoting myself here: "The biggest problem with finger injuries is that they never seem to fully heal, and worst of all, become early candidates for arthritic conditions". I also think he deserves a shitload of credit for powering through these injuries during grueling tours, finger injuries are painful as hell man, even if your not playing the guitar. Time for the Jack Daniels and the painkillers and the 'wheels roll on'.