Who starts if Marion Barber doesn't?

Marion Barber practiced Friday. Again, what he did was limited. Felix Jones and Tashard Choice did the heavy lifting during team drills. So, who starts if Barber can't go Monday night? Does Jones slip into that spot, or do the Cowboys start Choice and leave Jones in his current role _ yet with more touches than he got in the first two games? "If Marion were not to play, as to who is starting and who's playing, that will be determined later on,'' head coach Wade Phillips said. "We have a plan, but we're not announcing it right now.''