Line Up Help ROS

Standard league, I need to try and pick up a running back or two.

Who would you drop from the list?
M. Sanu
K. Benjamin
D. Westbrook.

My Starters are
A. Jeffery
G. Tate
M. Thomas
S. Diggs

I would drop Benjamin with his injury history, the QB situation, and the team possibly tanking because of their defense.