What happened: Detroit enters Week 1 without a fixed second option in the backfield. The reserve backs are expected to split work according to role and situation.
Why it matters: The rotation gives Detroit flexibility in dividing carries and protection duties. The season opener will provide the first live measure of how those snaps are allocated.
By the numbers: Detroit's two reserve backs have combined for nine NFL carries.
What to watch: Watch the snap and touch distribution among Detroit's reserve backs in the opener.