That's the range of RB13 - 20. Maybe he finishes top ten, in which case I agree with you, but I see the latter happening due to the Cowboys continuing to be "looking" for help at the position. Maybe that's for backup concerns, maybe not, but I would prefer a top 15 WR.
Personally, I agree with you. I'm not even convinced Randall will win the starting job. But because of that, whomever does end up winning the Dallas job will be able to be had after the first few rounds. That means the Dallas RB will be a huge value pick.