As I was lounging in the dental hygienist's chair this morning several hours prior to this thread, I focused on the "time-line" having read earlier the discussion about re-interviewing people who saw Terri and/or Kyron the morning of June 4.
In an elementary school, not all students have learned how to tell time. Even if there are clocks prominently displayed in classrooms and hallways, not every child in the building pays attention to the clock or actually knows what time it is throughout the day. Teachers are usually very time conscious because they have to plan lessons around a particular schedule that allows for recess, lunch, specials like art, music, physical education, library, special events, etc.
While there may very well be some second-graders who often glance at clocks and can "tell time", most 7-year-olds would not be able to provide reliable information regarding a specific time when they might have seen a certain person. That said, I believe that skilled LE detectives could work with Kyron's classmates by asking them specific questions based on the "time-line" that morning in the school, i.e. when the school opened, when the science fair started and ended, where they were when the bell/s rang, etc. Hopefully, LE has interviewed enough people - students, teachers, parents, guests - to reconstruct the events of the morning hours of June 4. jmo