Jeff George, Cody Carlson, Bucky Richardson, or Stone Cold Steve Austin. Out of the choices listed above, I would have to go with Andre the Giant. Dude would be a beast. He could come out onto the field on this:
For serious, Tebow. Every chance he has the dude just wins. He may have janked up mechanics but he fits the mobile QB system and his faith based style would fit with conservative ass Texans culture. I have always felt he could have been great if he just got an extended chance.