I am honored to call John Simpson my friend. He could fly just about anything and do well! He is a very talented pilot.
I think what was lost in my original post was that any pilot, no matter how talented, will do better if he has a "better" plane.
What's "better"?? Well in John's case it is another Cavalier! He has built at least a dozen, I think, since I have known him. Different engines, etc., but the design has remained his own original plane. Close to 40 years of flying the same "plane"! Could John do "better" if he went to a SV/Impact/Geo XL/Saturn/Avanti/TM/PM type of plane and practiced a ton? Maybe....... but I honestly believe that John isn't interested in doing that. Which is fine.
I have seen Bob Hunt do some amazing things with a Mackey Lark, then turn around and fly the wings off a Saturn. The Man can do the same with one of his "old" planes and one of his "new" planes.
The same with any of the other top 20-30 pilots in the country.
But I do not see them flying a Green Box Nobler on top 5 day. 
Bill <><
Disclaimer: I am neither a NATS Champion (yet), professional engine reworker, engine producer, column writer, Hobby Shop owner, *rockeet* scientist, nor otherwise. Just an old Advanced flier. 