With B J Symons injury I can't see the Texans making him their third QB this year. He's more likely to make the PS and get his chance next year.
J.J. Moses will be out in my opinion. He's very quick, but not fast and can't take one all the way. Your returner has to score at least sometime during the season. He was constantly caught from behind. Duff could get the job, or even Starling who has blazing speed.