Chester Pitts could help Seattle's depth

The Seattle Seahawks didn't really need Chester Pitts after adding veteran guard Ben Hamilton via free agency.

Their decision to add him anyway -- announced by the team Thursday -- will help if Pitts can recover from microfrature knee surgery. Pitts had started every game in Houston Texans' history before suffering the knee injury early last season.

The Seahawks, who also released defensive end Robert Henderson and linebacker Anthony Heygood, are getting another offensive lineman familiar with new line coach Alex Gibbs' system. Hamilton also has experience running Gibbs' zone-blocking scheme.

Seattle presumably protected itself against Pitts' health concerns. If that is the case, the team has nothing to lose from bringing aboard another lineman with vast experience and knowledge of the system. Pitts was a good, consistent starter at right guard -- make that left guard -- for the Texans.

The move to release Henderson comes nearly four months after Seattle acquired him from Detroit in the Rob Sims trade. Seattle also received a 2010 fifth-round choice in that deal. The Seahawks decided Sims didn't fit their system as well.