This team had an off year and was still probably the best team in the league, regardless of record. Were the heavy hitters on defense not playing up to par? Yeah, but remember they have played on average over the last 4 seasons around 2-3 more games than the competition. With those extra games being playoff football, which equates to my best v your best, balls to the walls football. I'm sure it takes a toll on the body more than the week 17 matchup against a 2-13 team.
So to put it all in perspective, the secondary was a mess this year, more than likely tired and playing through it or flat out hurt and out for most of the season, and still managed to be one of the best defenses in the league. Imagine if we had an OL that wasn't full of average to below average guys, that could sustain an extra drive or two more throughout the year. The amount of time the defense we have been able to rest, game to game, would have added up quite a bit by the end of the year. Or how about a healthy Beastmode, to keep the defense off the field that much more? I have no doubt if those two things would have been a reality this year, then we would be the team from the NFC playing in two weeks, but it wasn't to be.
Now, there are a lot of different reasons that could be picked apart on why this years team didn't make it to the championship. You could argue against the OL, the OC, the secondary, instability at RB, Graham getting hurt, etc., you name it and more than likely an argument could be made against it. With that said, a player like Earl Thomas is one the last ones I would throw under the bus, he is the silent leader of this team. Is he perfect? No, but when he's back at 100%, a legit 100%, the secondary will be right again and the team will be moving back in the right direction.