The Baltimore Ravens are the champions. They pulled the biggest win of the year and proved they were "better" than every other team in the league.

And they look vulnerable.

The defense just lost its captain, who retired on top, and will likely lose the ball-hawking safety that led behind the scenes. And the leading pass rusher, Paul Kruger, might also head for richer pastures.

Welcome to the salary cap era, and age where every team has questions. What separates a champion from a perennially weak franchise is how they handle those questions.

For the Vikings, 2013 is a big year. They bounced back in 2012, jumping from a 3-13 record to a close call for their division. Now they have to answer their questions, or risk slipping back into mediocrity.