I assume you mean "great" planes that never won the Nats. Because there are a ton of planes out there (including everything I ever built) that not only have never won the Nats, but never flown in the Nats.
Go to the "Classics" thread on here, page 3, Jim Pollacks question. Deja VU all over again. No matter, it is pure conjecture. What we do when not building or flying. Classic BS session. Hanger flying. Telling lies. Sea Stories. Fairy Tales. ETC.