Seattle Seahawks left tackle Russell Okung offered this glowing assessment of James Carpenter. “James, he’s an animal,” Okung said. “When he’s healthy, he’s hard to beat. I don’t think there’s a guy who can line up over him and really say they can beat him, when he’s healthy.” Carpenter’s ability to bounce back from offseason knee surgery and solidify the left guard spot, along with a spirited competition at right guard between John Moffitt and J.R. Sweezy, are areas of concern for an already solid Seahawks offensive line. The Seahawks have yet to go a full season with the same starting five on the offensive line since 2007, when names such as Walter Jones and Robbie Tobeck still graced the roster. But under the guidance of offensive line guru Tom Cable, the Seahawks are moving closer to that goal. The Seahawks finished with five different starting offensive line combinations in 2012 after using six different starting combinations in 2011. Establishing consistency and chemistry is a key part of the success of Cable’s zone blocking scheme. Okung and center Max Unger earned Pro Bowl invitations last season, the first time a Seattle offensive lineman has been voted to the annual all-star game since Jones in 2008. Seattle led the league in rushing attempts last season, with Marshawn Lynch rumbling for a career-high 1,590 rushing yards. Coach Pete Carroll maintains that his team will continue to lean on a run-first approach. The key for continued success up front is to limit the moving parts and do a better job of protecting quarterback Russell Wilson. Seattle allowed 33 sacks in 2012, tied for 20th in the NFL.