4. Dallas Cowboys: Myles Jack, LB, UCLA
With the addition of Alfred Morris, it may be safe to assume that the Cowboys are out of the running for Ezekiel Elliot in the first round. Because of that, the team can address the defensive side of the ball by grabbing Jack.
He can rush just as well as he can drop back in coverage, and would be an excellent three-down addition for the Cowboys. He even has the potential to cover tight ends at the next level.