I'm not a mind-reader, but from all the things I've read over the years, I think what CarneVaca was getting at was that Mick had to actually sit down, listen to what was on tape and really WORK to relearn both the cowbell break on "Oh Well" and the basic beat of "Tusk" before they could even begin to rehearse the songs. Of COURSE, by the time they got to the public stage, Mick had a firm grasp on both tunes again.
