After a lackluster 2nd and 3rd quarter, Sims came in the fourth and played great. His 8 for 13 for 82 yards looks like what Stanton put up last night. If he can continue practicing well this week it wouldn't shock me to see him get more playing time in week 3 against Oakland.
With Chris Johnson's hamstring injury it becomes possible that the Cards keep a 4th or even 5th running back. Grice may have ended up with 0 net rushing yards, but he was great as a pass catcher with 3 catches for 32 yards.
In case anyone was worried, Nelson's spot is secure.