Rod Smith seems to be thriving as a blocking back now. Until Saturday night, his touches had really been limited, yet he saw quite a bit of playing time as a blocker for Wilson/Marshall/Barrett. He was on the field for most of the Va Tech game when OSU was throwing, so one would guess he's the first choice for the coaches.
On this particular play, Elliott had a tough assignment, as he had to come across the formation to pick up the furthest outside threat, which happened to be a blitzing DB. That's not an easy block for an back, so the fact that he was able to get a piece was extremely important. For most backs, the easiest blocks to pick up are actually head on blitzes from a linebacker, as they simply brace for collision and make sure they don't get bowled over. Coming at an angle is much more difficult.