The Cincinnati Bengals defense is very hard to define.
You would be wrong to call it a 4-3 or 3-4 defense even though we see them line up in those sets at times. You also could see five defensive linemen and two linebackers, and the team will drop a defensive end into coverage. To run a defense with all of these multiple looks it takes some pretty specific talents to fit certain molds.
The Bengals may have found a player who could fit into their defense quite nicely that should be available late in the draft.