Stan Tracey specifically mentioned Thompson and Byas as being very difficult to work with, in the mid-60s period when he was 'house' pianist at Scotts. I think Ronnie might also have made words to that effect in print. Hadn't heard comments to that effect about Brew Moore.
For a guy as flexible and accomodating as Tracey to say that, he must have been difficult. There again, there is that amiable monologue from 1968 on the tape to Mark Gardner which appears on the Candid release, which gives an entirely different impression. An enigma !