While trying to replace multiple record holding quarterback Dak Prescott Mullen added the element of contact throughout spring practice .
Multiple record holding quarterback Dak Prescott is considered by most to be the best ever to play the position at MSU .
While trying to replace multiple record holding quarterback Dak Prescott , who is considered by most to be the best ever to play the position at MSU , Mullen added the element of contact throughout spring practice .