I think you do bench Richardson for MJD.
I've got him ranked mid range RB2, 18... word is that he's supposed to get a semi-full workload, but the SF run D is tough. They did get run all over by an RB with a similar style in Lynch last week.
Moreno took control of Denver's backfield in Week 2 and they should put up points against the Raiders... he'll have a shot to score.
Anyway... could do worse than Trich this week for many guys - I'm not benching him for Chris Ogbonnaya or some foolishness, but... consider it if you've got Moreno, even James Starks, etc.