NFL Playoffs: From Oklahoma State to the New Orleans Saints, Rob Ryan continues to overhaul defenses - Article Photos 3/5

FILE - In this Nov. 3, 2013 file photo, New Orleans Saints defensive coordinator Rob Ryan walks on the field before an NFL football game against the New York Jets, in East Rutherford, N.J. Dallas Cowboys' Jason Hatcher gives Ryan most of the credit for a transformation that has him second among NFC sack leaders in 2013. Now the Cowboys get to face their old defensive coordinator less than a year after he was fired and ended up in New Orleans. (AP Photo/Mel Evans, File)