I'm talking about need, not replaceability. RB is by far our biggest need. We can't get by without one.
Of course it's our biggest need and it has nothing to do with how difficult or easy to find.
Dallas went 12-4 with utter crapola on the DL last year.
Without Murray and the commitment to the run he inspires they are probably a 6-10 team. Even if the coaches truly understood and respected the running game like Bill Parcells did, they might have gone 8-8 at best without Murray, and would have ended Romo's career trying for the playoffs.
That said, the draft is all about finding relative talent. You can't win without a kicker, but you don't draft them in the 1st round either (unless you're Al Davis and think you are a kicker away from the Superbowl).