The Miami Herald is reporting that the Dolphin's running back competition is now "wide open" between Lamar Miller and Daniel Thomas. Many fantasy sites were claiming Miller would be a legitimate bell cow this season but now that seems to be more of wishful thinking.
The Dolphins backfield situation seems to be turning into a RBBC. Be wary of drafting Lamar Miller early in your drafts. Eddie Lacy or Shane Vereen seem to be much better options right now.