"Alabama's coaches must've learned that their pitchers were giving away or "tipping" their pitches to the other team as they were getting their grip. So, they began getting their grip of the ball by turning their sides so the 3rd base coach could not look into the glove. Unfortunately, the pitchers were completely negating that when they would drop out of the glove prematurely before going forward. An observant hitter will just watch the pitcher's hip and see the ball as it drops out of the glove with the grip attached. Once they see that, they will know what pitch is coming and should start making adjustments accordingly before the pitch is even thrown. So the movement that the Alabama pitchers were making, while it makes sense on the surface, is completely lost during the rest of their motion." HOP
This is the quote from Hillhouse Newsletter regarding the pitchers motion.