RENTON — Week-by-week, piece-by-piece, the Seahawks offense gets a little closer to becoming whole.
Sunday, it was center Max Unger who returned to help stabilize the line. Thursday, when the Seahawks play at Arizona, tight end Zach Miller is expected back after missing the past two games.
And soon, coach Pete Carroll said Monday, receiver Percy Harvin — the team’s prized offseason acquisition — will make his Seahawks debut.
Harvin, who had hip surgery Aug. 1, is eligible to come…