The Dolphins now have a full group of tailbacks that includes Knowshon Moreno, Lamar Miller, Daniel Thomas, Mike Gillislee and Marcus Thigpen. Not all five tailbacks are going to make the 53-man roster.
The most the Dolphins would keep is four running backs. Moreno and Miller, last year's starter, are locks. Thigpen has versatility as Miami's primary kick returner and also experimented a little at wide receiver. Position flexibility is important to Miami third-year head coach Joe Philbin, and that could help Thigpen stick.
Most likely, Miami would have to choose between Thomas and Gillislee.
Thomas is a former draft bust who never lived up to his potential. He was a second-round pick by former Dolphins general manager Jeff Ireland in 2011. But Thomas' career high is 581 rushing yards during his rookie year. Gillislee didn't get to show much his rookie year in 2013, but there is always that potential factor that he would have going for him.