My Observation,  Rolls Royce has just been protecting himself, not putting out the effort the last 3-4 weeks,  not wanting to get injured because of a possible Big Money contract with the NFL.    He was injured 5-6 games into the season, but the last 3-4 weeks Helfrich and Rolls both stated he was 100%.  

 Rolls has been  injured by the College defensive players,  just wait until the  BIGGER, STRONGER NFL Defensive players get a hold of YA..................
The clincher here is, sign the Pro Contract for  Millions of  $$$$ and if you get injured, you are still set financially for life.