They also say this:
Average foot speed. Has some stiffness in his body. Plays a bit flat-footed. Not sudden to get off blocks. Limited burst and explosion to reach the outside -- can secure speed backs. Will require some patience absorbing a game plan.
My point on Stinson is that he was not known as a great player. Good maybe, but certainly not great. I would think he would want to try and show out at the combine to raise his stock.