Many of the Superbowl teams get their wide receivers via Free Agency (Moss, Welker, Burress, Muhammed, Owens) and the Bills draft theirs (Evans, Reed, Parrish). On the contrary, the Bills spent heavily on Defensive Line in Free Agency and trades, and plan to draft their wide-receiver.
As long as the team gets the talent and the appropriate positions it doesn't matter if it is through the draft or via free agency. I see the Bills having a quality front for the first time since we had Adams and Williams side by side.