 Defensive lineUnder contract:J.J. Watt, Antonio Smith, Earl Mitchell, Terrell McClain, Jared Crick, p-Keith Browner, ir-Ra’Shon Harris, ir-David Hunter, ir-Tim Jamison.Free agent: Shaun Cody.Assessment: To be sure, there are no issues with the ends, Watt and Smith, but the popular, personable nose tackle Cody is 32 and has developed back problems, so he may have played his last game as a Texan. Someone has to be found to spell Earl Mitchell, though. David Hunter won a practice-squad job as a rookie, showed enough to get activated, then immediately got hurt. Once-reliable veteran Tim Jamison is coming off a torn Achilles tendon, which makes his future shaky. Photo: Karen Warren / © 2012  Houston Chronicle