I must disagree, Holmgren's game plan was horrendous...he relied on west-coast short passes into the flat, basic off-tackle runs, and a reliance on the tight end (Stevens) on over-the-middle routes. He never even attempted to stretch the defense...and he never showed variation from anything the 'Hawks did regularly throughout the season. He let big plays beat him...by never doing anything that led to big plays on his part. That gawd awful attempt at a screen pass to Alexander was the worst of the worst...everyone knew they'd try that, and everyone knew Alexander couldn't pull it off.
Yeah, they botched plenty, but still they appeared the stronger team. The Seahawks always did have a bend-not-break defense, but this time they broke at two critical points in the game. That's not inexcusable, but the lack of offensive production - especially when combined with solid play from their quarterback - leads one straight to the game-plan for fault.
That's the game plan that got the Seahawks to the SB, they're a WCO team, Holmgren is well known to be the closest adherent to the true Bill Walsh style WCO, I wouldn't expect them to come into the SB with a game plan completely different from how they got there. Dance with who brung ya, WCO brung 'em, that's the right game plan. Actually they threw down the field quite a few times but they all fell incomplete.