"You better make sure you're 100 percent certain that someone's going to make it through" waivers," Kelly said. "You look at Green Bay last year; all of a sudden they're signing guys off the street, because Aaron [Rodgers] went down. It's a tough deal. You look at St. Louis right now . . . In this league, if you don't have a quarterback, you're not going to be successful. I don't think you can ever have too many."