Cowher says he may let Bettis be introduced with the starters .
Bettis wo n't alter a script that uses Bettis in relief and as a short - yardage and goal - line specialist .
Cowher says he may let Bettis be introduced with the starters but he wo n't alter a script that uses Bettis in relief and as a short - yardage and goal - line specialist .