Interesting dilemma. Looks like Zbikowski is out and Pollard will start against Hou. Burnett has a broken hand and is a probable to play with a cast against Stl.
Pollard is going to be covering Owen Daniels who they will be going to a lot with Andre Johnson out. Pollard is set up for a nice game. He's still a risk, however, since he's still relatively new to the defense and hasn't done anything all year. I'd say go with Pollard if you are willing to take a little risk.