Seattle has two, seventh-round picks, one at 213 and a compensatory pick at 245. However, teams cannot trade compensatory picks, so Seattle is likely sending along its 213 overall pick.
At 6-foot-3, 278 pounds, Henderson was a sixth round draft pick by the New York Giants in the 2008 draft out of Southern Mississippi. Henderson suffered an ankle injury during the preseason of his rookie year and spent the rest of the season on injured reserve. The Giants released Henderson in 2009, and he spent some time on Jacksonville's practice squad before getting picked up by Detroit last year. Henderson has never played in a regular-season game.
With the latest move, Seattle still has nine picks in this year's draft.