Jay Ajayi is a strong runner who could be useful in short-yardage situations and in the red zone, both of which were areas of concern for the Dolphins last year.
Starting running back Lamar Miller (1,099 yards rushing) is adept at what he does best, being a fast back who can make some breakaway runs. But the Dolphins need someone to grind out some tough yards, and that’s one thing Ajayi does well.
Ajayi will likely be the favorite to assume the role of power runner without much competition in training camp.
Miller's workload is under pressure now with Ajayi in the fold. He was expected to go much earlier, so don't read too much into the cost of the pick. The Dolphins were looking for a back to complement Miller and they found one in Ajayi.