Who should I start at running back? Of these 3 not so good backs.?

First of all Dunn is playing for tampa not Atlanta. I don't know that status of Tampas fullbacks but i think they are still out so it depends if they are going to have graham play FB and block for Dunn but if Dunn is starting and getting playing time a would definitely pick him up. My second choice would be Kevin Smith even though hes playing a pretty solid D.