That player is Erik Walden.
With rookie Nick Perry replacing Walden on the outside, the former starter actually has better size for an inside ‘backer in a 3-4 and his athleticism would be a good change-up from that of Hawk.
The 6-foot-2, 250-pound Walden had his best game as a Packer in the 2010 finale vs. the Bears. He racked up 16 tackles and three sacks while lining up as a spy on Jay Cutler on most downs and being used more from the middle of the field.
With the Packers’ excessive use of 5 and 6 defensive backs, an athletic inside linebacker is needed and the guy in that role has been Bishop.
The middle of the field has been a weakness for the Packers’ defense and without Bishop, who was the team’s second-best defensive player last season, the weakness could be bigger in 2012. Defensive coordinator Dom Capers might need to look into more players on the roster to fill that void.