With a new DC bringing a whole new defensive scheme(4-3 to 3-4), I wouldn't expect the defense to look great in the spring game. In fact, I would expect to see a noticeable learning curve when the season starts. We'll probably look kind of sloppy early on as players figure out the new scheme. Hopefully we will have worked out a lot of kinks by the time conference play starts.
Also, several prominent defensive players were not suited up today... Eddie Brown, Frederick, and Mangan in particular. Those three were starters last year.