This isn't a "gang up on the Cardinals" pick, because I do love the Arizona offense in general. This is more about how impressed I have been with Chris Johnson so far this season.
The running back formerly known as CJ2k (as well as CJ1k and CJ0k), has run with a purpose that hasn't been seen since his early Tennessee days. He is also finishing runs and punishing defenders in the blocking game. I think Bruce Arians and the Cardinals would like Johnson to become their lead back, while Ellington and rookie speedster David Johnson do damage as change of pace backs.
Since this will likely be Ellington's first game back from a sprained PCL, I expect the Johnson backs to handle the heavy lifting. If you are an Ellington owner, look elsewhere for at least a week and let Arizona figure out how they will incorporate him into the game plan as the season progresses.