Coming into the new season, the power polls would have the Cardinals above the Seahawks just based on how last season ended. Once the real bullets start flying will depend on how the schedule is laid out.
Do you get the "tougher" out of division opponent at home or on the road? How well does the team stack up playing a 2nd place schedule vs the Cards playing their 1st place one.
Problem positions for the Seahawks were TE, OL, RB and pass rush. There are some key injuries that need to be resolved before you can consider those areas corrected or still a problem.
For the Cardinals, they are working on their Pass rush, TE and OL from FA. Will Mathieu make a full recovery or will he have to push through this season and look to be back 100% in 2017. This is the second injury for the Honey Badger if I remember correctly since coming to the Pros.
I would say that the Cards are lead dogs until the Seahawks or someone else in the division knocks them off the throne. Cannot tell the future so how it ends next season will require one to wait to know.
Homer in me says the Seahawks reclaim the division but the supposedly non-biased will begin letting you know what the national pundits think.