What will make the Arizona Cardinals stronger in 2013?

We all know that the Arizona Cardinals made a ton of offseason moves to improve the team. They changed leadership, they got a new quarterback, improved the offensive line and drafted several potential impact players.

But which area will make the Cards the strongest?

Will it be the coaching? Offensively, they have a new philosophy and want to push the ball down the field. Defensively, they sent Ray Horton on his way. They installed a different defense. But the defense is looking good in practice. and getting their hands on the ball.

Will it simply be the quarterback play?

Will it be the improved offensive line?

What about the pass rush with the addition of John Abraham?