I wasn't sure if this had been discussed. This, according to the Sunday Chronicle, officially moved Leonard Davis to guard for them. http://www.cbc.ca/sports/football/story/2007/06/07/nfl-cowboys-rivera.html "Veteran offensive guard Marco Rivera was released Thursday by the Dallas Cowboys. Rivera, 35, underwent two surgeries on his back in two seasons with the Cowboys, who inked him to a five-year, $20-million US contract on March 3, 2005. Marco Rivera was released Thursday. (Ronald Martinez/Getty Images) Rivera sustained a bulging disc in his lower back when he was running on a treadmill the week after signing with the Cowboys, but recovered in time to start 14 games before suffering a strained neck. The three-time Pro Bowler started all 16 regular-season games last season, but reinjured his back in a stunning 21-20 loss to the Seattle Seahawks in the NFC wild-card game. Rivera played 106 consecutive games (1998-2004) for the Green Bay Packers, who drafted him in the sixth round (208th overall) out of Penn State in the 1996 NFL draft. Rivera has two fumble recoveries in 155 games as a pro, including 141 starts."