Though the injury was significant, and the surgery needed to repair a muscle torn from the bone, Texans RB Arian Foster is healing much more quickly than many expected. There's even optimism from those familiar with his rehab that he'll be back on the field within the first month of the season.
Because of that, there's been less urgency for a few weeks now to get a replacement for Foster than there might have been otherwise. It's part of why the Texans haven't pounced on any potentially available running backs. The other part is their faith in their existing running backs to carry them until Foster's return. The Texans could have placed Foster on injured reserve with a designation to return starting Sunday, and opted not to do that.