Week 11 questions and more... witten,keller,V.Young and Pierre Thomas?

Ok I got my starting roster and its a power house! Few questions about my bench #1 should I infact start keller over witten. Keep in mind I'm a Texans fan and don't really want to start keller unless I absoutley need. If some how anybody thinks witten will have a good game because he's kitnas "patsifire" please let me know... ok now to my bench..... by the way thanks... 1. When is pierre thomas expected back? 2. will V.Y. or Keiland Williams be good for trading bait?