It's worth a shot in the 4th, IMO. Somebody just needs to show him how much money he lost because of issues playing the run. As purely a coverage guy, he's probably as good as some guys that will get picked in the 2nd round.
Jimmy Johnson went to great lengths to find guys who liked to play physical football. He said that people think guys don't mind the contact because they play in the NFL... when the reality is that many NFL players don't like to get physical.
He would pick and pick at their college coaches and tape trying to find guys who liked to play physically tough football. It was one of the main things Jimmy looked for (he said).
If it were just a matter of motivating guys to play tough, Jimmy would have had zero issues getting that out of players. Instead he spent a good portion of the pre draft process looking for physical, tough guys. I don't think you can coach that into or out of guys.
IOW, they have it or they don't.