ok...so since I am a little confused...the arm should not be totally extended at 12 but have a slight bend at the elbow..right or wrong??
I would agree that a slightly bent elbow and not locked is optimal at 12:00. I disagree with Coachdan that the ball should be close to the head at this position. In general, you want the arm extended as far away from the body but not locked. From 3:00 (2B base) to 6:00 (release) the arm drops into "the slot" a little more bent to maximize arm whip to and through release.