Peterson did not play in 2011, true. But he is not retired
Why didn't he play?
Carter is not only a 4-3 DE, but he prefers the left side, Ware's spot. Carter has been a 4-3 DE for every team he's played for: 49ers, Skins & Pats (Pats base this season was 4-3)
I think you worded something wrong there. Wares right, Carters left. And Carter does stand up plenty
Carter was selected by the San Francisco 49ers in the first round of the 2001 NFL Draft. Because the 49ers used a 3-4 defense under Head Coach Mike Nolan, Carter was moved to outside linebacker. While playing for the 49ers, he made 154 solo tackles, 32 sacks, and 12 pass deflections in 69 games.
Carter signed a six-year, $30 million contract with the Washington Redskins as an unrestricted free agent on March 14, 2006. The Redskins moved Carter back to defensive end, his natural position.......However in 2010 the Redskins hired a new coach, Mike Shanahan, who changed their 4-3 defense to a 3-4 defense which required Carter to play outside linebacker. The Redskins released Carter on March 1, 2011.