Next up would be the Arizona Cardinals as they have a premiere back in David Johnson looking to increase his workload. That leaves backs like Andre Ellington and Chris Johnson available for a potential trade.
Either player would be helpful at this stage of the offseason, however, Johnson is the more complete back and may be playing for something more than just a paycheck. Ellington is still young enough to carve out a niche role for whatever team he plays with (if he can stay healthy).
Staying within the division, the Seattle Seahawks could also see some movement with their running backs. Eddie Lacy is the presumptive starter in the Seahawks offense which leaves Thomas Rawls and C.J. Prosise waiting to compete for bigger roles.
Rawls is coming off of an ankle injury that sidelined him for quite some time and could not be ready for a full workload. Prosise is more of a third down back and it would be hard to see him jump over the players Dallas currently has on the roster.
Finally, we come to the Kansas City Chiefs who have seemingly built a running back committee from scratch. Spencer Ware will lead the way on the ground this season which will put Charcandrick West and C.J. Spiller looking to have complementary roles.
West has shown the ability to lead a backfield and put up decent numbers when asked while Spiller is more a long shot/depth addition. None of these players are going to be like the most talented back in the game of football (Ezekiel Elliott), but they could keep the Cowboys offensive juggernaut running for six games.