Here's another thing I've been thinking of...
Gary Kubiak, the Texans coach, has been with the Broncos, behind Shanahan for about ten years. What are the odds he begins to implement Denver's zone blocking scheme in Houston? The old offensive line coach went to Atlanta and now they're the top rushing attack in the League. Who's to say it won't, over time, be the same case for Houston? If it is, he won't need a Reggie Bush type to be able to run the football successfully. There could be something to the fact that they picked up Ron Dayne, who is perfect for that system (ran it at Wisconsin)