What about playing him over a midline starting RB, like a McGahee or a Foster. I see Tatum as a high-risk, high-reward play this week. I see him getting 15 touches, and his production then relying upon whether or not he breaks those 1-2 long ones.
I think Bell is going to get a glut of touches to try to get him to the 1,000 yard mark, and to gauge how well he can handle the featured RB role. I expect him to fall short of 1000 yards, though, since Denver struggles running against the 3-4.