C. Sims vs. J. Gray vs. C. Michael vs. Peterson handcuff

I drafted Charles sims very late as my 5th rb, dropped him for Jonas gray, who promptly got cut, so I dropped gray and picked up Christine Michael.

I have Adrian Peterson, so would you stick with Michael or pick up petersons backup (who may be in a timeshare with Asanti if AD goes down)? Gray is still on the waiver wire (possible Browns pickup), and Charles sims is still available.

1ppr scoring.