What to do with DJ?

What are your thoughts on David Johnson? My RB’s currently are Fournette, Hunt, Gordon, and McKinnon so barring injury I won’t necessarily need him if/when he comes back. With Palmer out now and the Cards season looking bleak, along with the AP addition, should I try to trade him? Even if for a bench player? I picked him up on waivers when he went down and have stashed him since, but starting to think I could use the bench spot.

IMO he no longer has any value. Arizona is going to have no reason to bring him back and risk injury on the future when Palmer is out.