I am also a Bru fan but as most have already pointed out, he is at best a situational player at this point in his career. Keep in mind he did not register a sack last year, or in the last two years been able to force a fumble or make an interception.
In 2008, before injuring his knee, he played in 52% of the D's snaps last year which should be less in this upcomming year. At the end of the day, if you factor in his age, lack of the type of game-changing production he normally provided to the team and with the emergence of Gary Guyton (6'3" 250), if he starts, it'll be based on respect- not production. Additionally, on some passing downs, you may see AD move to the inside and let Woods and Crable russ the QB.