When did the run on big corners happen? Who is a "big" corner. Peterson, Sherman, Haden, Jenkins, Slay, Norman, Davis, ... Any of those guys big? 16' draft you have Ramsey, Apple, Burns, Jackson, Alexander .. I don't see the dramatic change at the CB position that is going to lead to a push on smaller WR's.
Mike Evans is much more valuable than a Brandon Cooks,
now and forever. Cooks is certainly a better player than Goodwin but that's not a guy I'd pay/trade for. Look at Gabreil in Atlanta, or Benjamin in SD, Edelman in NE, you can get value in smaller WR's if of course you find one that is a football player and put a QB on the field with him.