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The Dolphins will be heading into the season with a very young group at running back and fullback. Reggie Bush left for Detroit and the starting job has now been passed down to Lamar Miller.
Miller has the talent and ability to carry the load for Miami, but has had limited playing action. He seems to be the perfect fit for Joe Philbin's offense, and Ryan Tannehill feels comfortable with him as the starter. He's able to carry the ball on the inside and bounce it to the outside. He also has good hands that allow him to catch the ball in space and showcase his speed. He was limited last season due to his inability to pass block, which it appears he has improved.
Behind Miller, Daniel Thomas and Mike Gillislee will be fighting for the No. 2 spot on the depth chart. This is Thomas' third year and he has yet to show he is capable of handling his duties. He has been injury-prone during his tenure and has lost Philbin's trust.
On the other hand, Gillislee has shown some ability early on. He has shown his ability to carry the ball and his ability to pass block. This will be one of the most intense training camp battles.
Jonas Gray will also be battling with Thomas and Gillislee, but he won't be in the conversation for the No. 2 spot. Gray, like Thomas, is a big, powerful back that can be used in short-yardage and goal-line situations. If Thomas shows that he hasn't improved, Gray may overtake him for the No. 3 spot.
At fullback, the Dolphins have been in the mix to sign Vonta Leach. For now, they'll go into camp with Jorvorskie Lane and Evan Rodriguez. This is Lane's job to lose, and I don't think he'll lose it.