I've heard Shanahan say this before and well considering what happened Sunday its proven to be true once again. Also if anyone one is inclined to think that Young starting over Henry means something more, this article indicates something different.
http://www.profootballweekly.com/PFW...wwhi121207.htm
Shanahan likes having RB options, but Young remains the starter
Dec. 12, 2007
“You can never have too many backs,” head coach Mike Shanahan said on Monday, as rave reviews were streaming in over rookie Selvin Young’s 156-yard performance against the Chiefs in Week 14’s blowout win. Shanahan surprised some observers by giving Young such a heavy workload and using Travis Henry basically just to give Young an occasional breather and in mop-up duty, especially considering Henry had a weight lifted off his shoulders earlier that week when he won his drawn-out appeal with the league over a potential drug suspension. Shanahan isn’t about to throw in the towel with Henry, who was the NFL’s leading rusher after the first four games this season, but he intimated that Henry is not yet back in football shape after missing four weeks around midseason with rib and knee injuries. Shanahan rather enjoys the luxury of having a stable of backs that also includes Andre Hall, especially when taking into account how all of them have been banged up at different points this season. Until further notice, the shifty Young will remain in the starting lineup, a responsibility he certainly isn’t taking for granted as an undrafted first-year player. “My thing is just to keep pushing and take advantage of every opportunity I get,” Young said. “I could be here today and gone tomorrow. It’s great to be somewhere and have a home where people believe in you.”