The arm slot is not as important as people may think. The KEY is, where is your elbow? When you have your elbow above your shoulders, it is what is called “hyperabduction”. I can send you to an interview done, with an orthopedic surgeon, of the pros and cons of hyperabduction. For those Interested in the scientific “garble”, its right here!. When you look at a picture, of a pitcher (preferably one with a proven career). Look at where his elbow is inline with his shoulders.