The Seahawks defeated the Panthers last Sunday because the Panthers are not good and Seattle got off to a hot start. But by the end of the game, Seattle was basically playing with a bunch of rookies and Carolina was picking up tons of yards and scoring fairly easily. And this is when key injuries were just on the defense.
On Sunday against the Cardinals, Seattle will be without one or two offensive guys too. Duane Brown is out still dealing partly with a biceps injury. My feeling is that Seattle is mostly just giving Brown a week off to rest up for the 49ers in week 17 and whatever playoff run is to follow.