Drop Big Ben or Alex Smith for Chris Johnson?

I am in a 10 team league, I have Drew Brees, Big Ben and Alex Smith benched. I don’t think I should keep all of them, and am thinking about picking up Chris Johnson at RB.

Should I make the pick-up/drop. If so, then who?

Clarification, I have Brees starting. So I don’t want to drop him.

I wouldn’t drop any of your QB’s for Chris Johnson especially in a 10 team league. He offers almost no upside. You should consider trying to package one of your QB’s for a RB if you are in need of one.