Yes there is a gulf between the very best and the merely exceptionally good. The guy down your local pool hall who "never misses" would be in bits if he somehow was freerolled into the last 16 of a major professional pool tournament. The clock pressure would get to him even if he is used to playing with a shot clock.I was watching women's matches that occurred before the 30 second shot clock became the thing. If you didn't put women on the shot clock the only matches worth watching were the matches between the top 6 players in the world of that division. Now because of the shot clock women's pool is becoming watchable.