Doctors have told him if can demonstrate a proper shaka with the middle fingers on his throwing hand, it is evidence his injured tendons and nerve damage are fully healed. If not, he won't have the tensile strength to grip the ball and throw it with velocity.
He has steadfastly refused to do anything that could remotely indicate he's willing to exhibit behavior in support of BYU. The pressure is mounting on him continually though, and teammates have seen him trying to do the Shaka, only only to quit, and violently shaking his head in disgust. Stick to your guns Cameron, there's an important Yewt principle at stake.