The health of key veterans like Matt Hasselbeck and Walter Jones?

Greater balance on offense, with a new emphasis on the running game?

A honeymoon period for new head coach Jim Mora?

Undoubtedly, all will play an integral part as Seattle hopes to rebound from a disappointing 4-12 season last year.

However, it's the defensive line that could make or break the Seahawks this year.

Mora has moved quickly to make changes to a defensive unit that was overworked and underproduced in 2008.

The Seahawks ranked dead last in the NFL last year on passing defense, giving up 259 yards per game on average.

Only the Cardinals and the Jaguars conceded more passing touch...

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