Except it turns out that all the doors were unlocked that day. Billylee posted the news article just today that's the source for the info, but I can't remember which thread.
Maybe Kyron saw the flower bed kids outside and went out to see what they were doing outside.
Here it is again:
Article from Sept. 7, 2010:
http://www.kgw.com/news/kyron-horman...102148389.html
Next week, Skyline School will begin locking side doors. Previously, they'd been unlocked. Only the front door and ADA access door in the back of the school will be open during the school day.