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He is stoked to start, but Heath Cummings finds too many unknowns to have more confidence in his first top 40 dynasty running back rankings.<p>I want to be clear. I am very excited to be back in the the dynasty rankings business. This is my favorite format and by far the most interesting, in my …

Read more at CBS Sports: http://www.cbssports.com/fantasy/football/news/fantasy-football-running-back-dynasty-rankings-ezekiel-elliott-tops-the-list-but-uncertain-futures-cloud-middle-tiers/