On the first defensive series against Detroit, Bernard, Milano, and Dorian Williams were on the field on 2nd down. The play was a run to Montgomery that went for little gain. I think they didn't again on the 2nd defensive series. After that, injuries started piling up and so I don't think they went back to it.
I think there is some interest in having Bernard, Milano, and Williams in against certain looks.
A lot less likely to get injured when you're the guy jumping on the pile at the end of the play.