Zenner did not log an offensive snap Sunday against the Vikings.
With Theo Riddick yanked after blowing an assignment in pass protection, it was rookie Dwayne Washington -- not Zenner -- who took over running back duties for Detroit. This is notable because Washington was a healthy scratch last week while Zenner operated as the Lions' big-back complement. As such, the backfield appears fluid behind Riddick for the time being, but should push come to shove, Washington is the best bet to serve in the No. 2 role moving forward.