Gotta say it's shutting down Foster. Not just shutting down Foster. But if we can make the Texans one-dimensional, I think our defensive backs are opportunistic enough, and that we can get enough pressure on Schaub, to create some disruption and chaos. That equals turnovers and a defensive touchdown.
My admiration of Schaub is well-documented, but we put it all on his shoulders, our defense is good enough to force him into mistakes. But we have to contain Foster first.