Shonn Greene or Jamaal Charles for Week 3 start?

I have Amhad Bradshaw starting but need a 2nd back. I have Greene, Charles, and Donald Brown. I picked up Brown with my last pick just in case the Colts realize Addai is a softy and decide to run with Brown but i don't plan on using him until that happens if it happens. For now i need to start either Greene or Charles. I can't understand why Charles isn't getting 80% of the touches in KC and as a Charger fan I can't understand how LT is doing so well. Either way I am in a pickle. Charles vs a tough SF run defense or Greene living in LT's shadow (for now). I think LT will slow down or get hurt soon so Greene has some upside but when will the chiefs wake up and run the heck out of their fresh legged speedster in Charles!?!? Please give me your opinion on this week.