Detroits CBs are still the worst.
Seattle has improved multiple ways.
Oakland's only glaring weakness was QB so yeah.
The Giants secondary and DL has improved.
The Chiefs have improved in the secondary really just with Eric Berry, and Dexter McCluster, and Thomas Jones on offense.
The 9ers should have a pretty stacked team.
The Browns are maybe the best, worst team on the game. Great running game, an option of QBs, secondary has improved tremendously with Sheldon Brown, T.j Ward, and Joe Hayden. The O Line is solid, all they need is a WR really, maybe some LBs.