Probably the most important misconception about concussions is that they always involve loss of consciousness. This is simply not true. In fact, most do not. There are three grades of concussions. In only one does the victim lose consciousness for seconds, minutes or longer.
Q : I think "does" is used as a noun meaning "grade" or "step".
If it does not, "In" is utilized as a conjuncton, which is odd to me.
What do you think?
All the best,