Haynesworth is a cancer. Last Christmas the Redskins moved their practice time up so the team could get home early to be with their families. Haynesworth didn't like that so he
protested by showing up over an hour late and urging his teammates to do the same. If the Texans show signs of crumbling down the stretch again, Haynesworth's brand of leadership isn't going to help them pull it together.
Maybe that's worth putting up with when he plays like has when the carrot of big $$$ is hanging in front of him, but based on his history (including 2009) there's no reason to believe the dominant Haynesworth would show up in Houston.