@jcraig - I have heard a similar story occur with a pitcher in the minor leagues. I heard that he broke his clavicle somehow and he had to go from throwing in a straight over the top motion to a more to the side motion. He became a better pitcher because of this change because his unorthodox motion helped to fool hitters more.
The only reason that he changed his motion was because the broken clavicle forced him to change his range of motion because he simply could not put his arm over his shoulder very well. I experienced a similar injury several years ago and still have problems to this day trying to lift my arm above my head.