I saw that piece on Allen. The fact that he is always able to repeat his form is what, in large part, makes him a great shooter. No different for pitchers in baseball. Many attribute AJ Burnette's struggles, despite having great stuff (especially when he was younger), to not being able to repeat his delivery. Contrast that with a guy like David Wells, who while not exactly being in great shape, could repeat his mechanics in his sleep (making his control impeccable).