The Arizona Cardinals had 84 offensive snaps against the St. Louis Rams. Normally the workload is fairly evenly divided at running back. On Sunday, it wasn't, which has traditionally been the case for a Bruce Arians offense. Rookie running back David Johnson played a whole bunch.
Let's look at the snap counts for each position.
This was the perfect way to get Drew Stanton a few snaps. The Cardinals had a big lead and Palmer could take a few plays off at the end.
Not much sharing of snaps here.