Certainly there are some that will excel with the no-thumb technique, just as there are some 200+ two-handed bowlers.
My experience from seeing a lot of these go by... they hit the pocket a ton and get a lot of strikes on house shots. However, many of them seem to miss a lot of spares, and have a lot of trouble on the tournament shots.
As I said, there will always be those that can bowl PBA numbers even throwing a backup ball, or between the legs. But I think that in the long run, cool points don't pick up your average much.