Crap! At least it's a mild concussion, but it's still is a concern that RB Brandon Jackson becomes susceptible to concussions in the future. The team is doing the best thing by keeping him out until the season starts.
The silver lining to his injury is that 7th round pick RB DeShawn Wynn will get a bunch of playing time. Wynn looked pretty good in a very limited opportunity during the televised scrimmaged at the end of July. He has been hurt ever since then so it will be interesting to see him play in a game.