The glove arm should not be forced to stay in line until release. The body rotates to throw and if the glove arm does initially point, it gets pulled in as soon as the body starts to rotate. The glove should be at the side of the body before the ball is released.
I'm not fond of drilling the positions like that. Maybe to help demostrate, but it loses the flow and weight transfer if drilled too much.
Initially, I don't mind teaching the grip and flicking the ball to get a feel of the ball, but don't see how wrist flicks help anything as a drill.