Sorting through Seahawks' roster moves

There was some thought before the 2012 NFL season that James Carpenter, the Seattle Seahawks' 2011 first-round draft choice, might not play again until 2013.

Carpenter did return from a serious knee injury in time to start seven games.

2012 NFC West Receiving TD Leaders

But after a concussion and knee trouble slowed him, the Seahawks shut down Carpenter for the season by placing him on their reserve/non-football illness list Wednesday. The team also released receiver Braylon Edwards with a waived/injured designation. They signed guard Rishaw Johnson to the 53-man roster from the practice squad.

Carpenter has now missed 16 of 28 regular-season games as a pro. The team moved him from right tackle before the injury to left guard this season. Carpenter was trying to work his way up to speed, but he sometimes had trouble moving quickly enough to execute blocking assignments. John Moffitt, a third-round choice in 2011, is expected to replace Carpenter in the lineup. He started nine games at right guard last season before suffering a season-ending injury. He has four starts in six appearances this season.

Edwards caught a touchdown pass during a Week 6 victory over New England. He has not caught a pass since that game. Meanwhile, Sidney Rice and Golden Tate have emerged as consistent producers. They are tied for the NFC West lead with seven touchdown receptions each. Third receiver Doug Baldwin is also healthier than he has been recently.