Here's the exchange that led to the revelation from Richardson:
@saebhaidar not this week man— Daryl Richardson (@DRICH_26) October 2, 2013
Richardson has been the Rams starting running back since the first week of the season. However, he produced just 114 yards on 42 carries during that stretch, averaging just 2.7 yards per attempt.
The Rams were going to use a committee approach to running the ball this year, but it's been mostly Richardson through the season's first four games. The running back with the second-most attempts is Benny Cunningham with 10 carries. Isaiah Pead has seven carries for 21 yards.
Big deficits on the scoreboard and a preference for three-yard passes has been a hallmark of the Rams offense this season, marginalizing the run game.
So who takes over? Normally, Isaiah Pead would be the guy, but he was inactive last week against San Francisco. Cunningham could see more touches if the Rams do go with more of a power running game. Rookie fifth-round pick Zac Stacy, who led the SEC in rushing last season, has been all but invisible in Brian Schottenheimer's game plan this year.