I think what happened last night was largely determined by who was active. By having only 4 d-linemen active, they almost had to play nickel most of the night. It might have had a chance to work if the Packers had gotten ahead and forced Seattle to abandon the running game. But when just the opposite happened, the Packers simply didn't have the horses to survive the onslaught. The decision to have active only 4 d-linemen against Seattle's offense was questionable at best.