Rudy was a walk-on who played about 2 snaps.
McDaniel is a full scholarship RB with 203 yards on 39 carries (and he damn sure could've caught the ball better out of the backfield than Atkinson - so could every other RB on the roster for that matter).
If I'm the coach, Atkinson is done. I don't care if he has home run ability. He's can't run the football. Either move him to WR and see if he can grow a pair of hands or move him to #3 or 4 at RB so the actual RB can get some practice reps.