The "injury" is not from last night. As said, it is very minor. Kolb needs work. Idiot fans boo'd Kolb and would pitch a fit if EJ doesn't start from here on out. So, EJ is told he must get the maintenance on his knee done now. He may or may not be ready week 1, but coaches don't care now. They need to see Kolb and get him ready to play. Kevin's play over the next 2 weeks will determine whether EJ might play week 1 or at all, for the foreseeable future.
Whether you want to believe it or not, this is likely some variation of the truth.