I suspect he is getting rest due to being a old veteran and due to all the injuries he's had.  It's not uncommon nor really alarming to me because I think we will get a productive year out of him.  I don't see him back next year but who knows.  I was looking forward to seeing Henderson in there but there is just no reason to play him right now.  He and Booker will likely get some time during the year as RBs seem to always go down for a game or two.  Kudos to Elway for picking up Charles as he fits perfectly.  Compare that to NO picking up Peterson, where it is a square peg in a round hole.