what we don't have is a log of whatever commercial dates he was doing. Maybe he had multiple sessions on the same day? Maybe his amp got damaged in transit, or delayed in transit, whatever, and he had to use a house amp that he could not adjust to get his normal tone? Stuff happens, right, and there's got to be a logical explanation as to why Kenny Burrell doesn't sound like Kenny Burrell while still apprently actually being Kenny Burrell. True, and I think your scenarios make a lot more sense than this guy's: "Unfortunately, Kenny Burrell, another famous star, is not so spotlighted on this album as we expect (probably because Richard Wyand's left hand comping and Kenny's guitar interfare each other)." I just listened to the track again for the first time since Michael made the ID, and (of course) it sounds even more like Kenny than it did to me before. It sounds like perhaps his treble was just rolled off (whether by KB or the engineer) more than usual, but it also could have been foreign equipment, I suppose. To me he sounds a little uncomfortable or slightly uncertain with a change here and there, which seems to disrupt the usual chemistry of his phrasing.