Maybe Scott if his medical continues to be an issue in practice. And I'll go out on a limb and say Elliot Berry if the coach riding his butt is any indication of how he is performing.
This morning, on the radio, Jimmy Hyams said that Lane was #1, Hurd was # 2, D. Young was # 3 and Scott was #4 in the running back rotation.
Scott is just like Lane. He can catch well. can run well but doesn't have blazing speed, etc. etc.