I recorded the Senior Bowl and watched him. Willis has the speed to be a sideline to sideline LB. Sometimes he can take false step, but he has the speed to make it up. He sometimes has problems shedding blockers. He wraps up tackles though. When he's unblocked, he can fly to the RB and wrap up. Can't tell you much about his pass-covering skills because of T.V. camera angles.
My favorite is Stewart Bradley, Nebraska, 256 lbs, 6-4. In Senior Bowl practice, it was noted that he did a great job in coverage against TE and RB. We need somebody who can cover guys like Dallas Clark.