Too much time has passed. Too many involved, too many saw the shooter, yet still no ID on the shooter, no leaks from witnesses, no ID reports from the media.
Based on this lack of ID, it would seem to point to an unknown shooter, or someone that was not connected to the campus. Then again, I know as much as anyone else here.
Another funny thing ... WSLS was just talking aboout this and they say whether the shooter was male or female, faculty, student, or someone else is even known for sure.