AG, because of his height, needs an outside shot. He needs his defender to respect his ability to hit an open 3 so he could go around him. Once in the lane with the defender on his back, he could do some damage. With his outside shot being off, his defenders are leaving some room (knowing they can come close to closing out on a shot anyway with his lack of size). Now he's dragging multiple defenders into the lane, but not beating them. He's trapping himself. He's always overpenetrated (that's what she said), but it's become worse. If he doesn't fix the outside shot, he's in trouble.
That being said, he was a decent shooter (even if not consistent). It's not like asking Taliek to become Ben Gordon. Something happened to AG's shot (physical or mental) so hopefully he can get it back.