I don't know much about him, but it seems clear to me one of the front three (Walden, Green, I'm looking at you) are on the way out. Green was a good mid-season pickup, but his production faltered this year. (Clutch SB play, yeah yeah). Walden is also a role-player, but his off-field "issues" leave concern.
Does this mean GB looks for a DE later in the draft? Maybe not 1-2, but a 3rd round pick if available. Again I'm just speculating.