Sultanofswat,quote:
“I thought this was a timing issue where the arm should be up at foot plant.”
It could be considered a timing issue but in all actuality it is a mechanical issue.
Most pitching injuries are caused by the position you attain prior to actually forwardly
Projecting the ball, this is why the pendulum swing direction and articulation has to be performed correctly in order to set up forwards force from as far back as you can achieve by outwardly rotating your humerus at the back like outfielders whom Crowstep correctly.
Traditional pitchers perform “Late transition” off to the side long after foot plant deleting most forwards body mass velocity from their splits crotch drive to a stop then throw.
This late transition causes “forearm bounce” degrading the UCL with every pitch.
The mechanic of bringing the ball up in pronation (traditional) leaves your forearm down and your humerus up causing you to outwardly rotate your humerus during humeral flyout instead of at the back where you can attain a longer ball driveline.
To perform your transition earlier you need only bring your ball arm up pendulum swinging it in supination (thumb up) then turn your elbow up another 90 degrees more by outwardly rotating your humerus so that when you start initial forwards force the ball is still at the back instead of off to the side.