6. Strengthen the backfield

Knowshon Moreno produced his first 1,000 yards rushing season last year, but if this 26-year-old back were really a difference maker the title contending Broncos would have never let him sign his one-year, $3 million deal with the Dolphins. Lamar Miller has ability, but hasn't put it all together in his first two seasons. And Daniel Thomas, who is playing on the last year of his rookie deal, isn't the big, physical back he was advertised to be. The Dolphins need to find a youngster they can develop.
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