The Cardinals took back five times that much from the player Lenon outperformed.
The cut comes amid what should be renewed expectations for Bradley, who signed with the Cardinals in free agency and struggled with his conversion to a 3-4 defense during a lockout-shortened 2011 offseason.
Bradley, formerly of the Philadelphia Eagles, should have a better chance at adapting with a full offseason to prepare. He made one start and played 21 percent of the defensive snaps last season. Lenon, 34, has proven he'll be tough to unseat. He played 95 percent of the defensive snaps, most among Cardinals linebackers.