The local Palm Beach Post projects Daniel Thomas to be the Miami Dolphin's "goal-line and third-down back". Daniel Thomas didn't do very well last year, and had ball security problems, but is much better in pass protection and has improved his fumbling problems. He's a big guy, and has struggled with short yardage situations in the past, but if he does indeed get the role, bump him significantly up in your rankings, and move Lamar Miller down. 
I'd take Le'Veon Bell, Ahmad Bradshaw, and Reggie Bush before Lamar Miller in all formats, but esp. PPR.