Well, Fred Jackson and his one really good season 13 years ago isn't walking through that door. But so what?
Bills loaded up at WR this off-season, how do you know what their game will be like? If Cook catches over 80% of his targets this year, I would take it. Diggs disappeared after thanksgiving last year--they still won 6 in a row. Ditto for Davis after Halloween. What were the Defenses focusing on?