I think opinion was spread wider than that. There were a lot of Chris Johnson guys. I didn't like Johnson, Jones, or Mendenhall. I was convinced Ray Rice would be the best back in that draft.
If I were Dallas, I would do exactly what Baltimore has continued to do...draft short squatty guys. Pierce was not a "complimentary" type. He can do what Rice does.
It makes things easier. It is the same rationale behind getting QBs with similar skill sets.
I would prefer two backs, both who can function in the system. Frick this "thunder and lightning" horseshat which honestly has never been able to work since Chuck Muncie and James Brooks.
Just get two good backs.