I wouldn't call a HOF RB an unknown quantity. Once upon a time Ingram was an unknown quantity by that logic when we let Bush walk. I think Peterson is here to bridge the gap between this year and next year. Cooks being traded should all but tell you how Payton feels about players who complain about not getting the ball which Ingram has done multiple times during the game on the sidelines throwing fits. It's embarrassing to Payton and the coaching staff and it makes the team look bad.