I read an interview where Streater said he had the same problem Sammy had but on both his feet. He had two good years with the Raiders with the stats and playing time on the upswing, then came the injuries.
He's obviously healthy now, so it's probably the natural thing that he makes the team, because he's a good, consistent player. Having Holmes as athe fifth WR with Tate as the special team player can't be considered a bad thing for this team.