I totally see what you're saying regarding Like a Rolling Stone and the others, and I LOVE the Isle of Wight tracks, but in my opinion they ruin the flow of the record. At a certain point, Dylan decided to "throw everything at the wall and see what sticks," but there was a perfectly great folk album in there already. Chalk it up to general frustration and his puckish sense of humor I guess. Including the Isle of Wight tracks as part of Self Portrait puts the album into the realm of messy odds-and-ends compilation, when Self Portrait really is a highly focused exploration of the folk tradition as Dylan was living it, ca. early 1970. The album would be a clearer document if it were only studio material. Besides, Isle of Wight deserves its own full, separate release, rather than forever being a footnote to Basement Tapes / Nashville Skyline / Self Portrait!