[Jeff Higgins]

Adrian Bellew did his best work with David Bowie, Frank Zappa, and The Talking Heads. He didn't seem like a "fit" in King Crimson, at least not to me.

Bellew and Fripp originally got together post King Crimson to form a band that they were going to call Discipline. After working together, however, they changed the name back to King Crimson and released the album called Discipline. That was when Fripp famously said "King Crimson is not a band. King Crimson is a way of doing things". And yes, they have had a pretty "fluid" lineup over the years. I get the impression Fripp might be difficult to work with. He appears to come up with a concept, and "assembles the musicians" he deems suited to carry that out.