This is my opinion, that Kyron was taken from the school,either by someone he knew, perhaps slightly,or by a stranger. With regard to the Science Fair : I've chaperoned quite a few of them. In a school the same size as Skyview. I remember that it was very hard to keep an eye on who was coming and going, before we got cameras put in. IMO the worst part of this is the fact that hours went by before Kyron was even missed.It gave whoever took him a huge advantage. And I agree with e PP who wrote about the need for LE to clarify things before school starts again. Right now, all opinions are valid IMO.
All JMO
This is a point I've been wanting to zero in on for a while now. Basically no one other than Terri or an accomplice of Terri's would have been in a position to carefully plan out the abduction of Kyron from school that morning. So let's assume for the sake of discussion that it was Terri (realizing that it could just as well have been an accomplice of hers).
She plans some way to get him out of the building and away from the school grounds, without anyone seeing her do that, and then to either hand him off to someone or kill him and dispose of the body. The cell phone pings from Sauvie Island suggest that possibly that could have been the planned location for the hand-off or disposal, and though it's not terribly far away in miles, it's a significant distance from anywhere she would have had a plausible reason to be that morning. But if this or some comparably remote location was part of the plan (and if there was a body disposal close to the school, gym, or home, it's hard to believe it wouldn't have been found fairly quickly), how could she or *anyone* know in advance that they'd have a long stretch of time to hand him off or dispose of his body before the alarm went out that he was missing? How could she not have had to have a plan that could put her where she was supposed to be (and preferably with witnesses) within a very short time of leaving the school, to handle the expected call from worried school officials who could find Kyron?
There was a rumor early on that she'd said something to a teacher about a doctor's appointment on Monday that would make Kyron late, and speculation that the teacher might have gotten confused when she noticed Kyron missing and thought Terri must have meant the appointment was "today". But I think there's fairly well-documented evidence that when the teacher's aide taking attendance an hour or so after Terri left, noticed Kyron was missing, the teacher said something to the effect that he must be in the bathroom -- in other words, didn't say "don't worry, his mom told he had a doctor's appointment and would be back later". And at any rate, Terri really couldn't have deliberately set up something to make teachers not worry that Kyron was missing, without making herself instantly the number one suspect in his disappearance.
So what *was* her plan, in the event that his disappearance came to attention of school officials very shortly after she'd left? If she abducted him, she *should* have been expected a worried call from the school within a pretty short time. That might help explain why she left her cell phone on -- it would have been hard to explain why a mother going about daily errands would have had to have it off (not just ringer off, but totally off so that it wouldn't be sending out any traceable pings). There woud really have been no plausible explanation for even having the ringer off, unless she was somewhere with other people (e.g. working out at the gym) where it would need to be off to avoid disturbing others. So what was her plan for when the phone rang half an hour after she left the school, and a school official was reporting Kyron couldn't be found when the small groups were being assembled to tour the science fair (around 9AM, and then add 15 minutes or so that they'd have searched the school for him before calling his mother)? How would she explain not being able to get back over to the school very quickly, or at least give a verifiable account of where she was if she wasn't at home or at the gym or at some local store? If she still had him alive in the truck, what plausible story could she possibly make up that he wouldn't quickly refute? If she had his body in the truck . . . well, presumably she wouldn't have answered her phone, but they'd have kept trying, left messages, presumably called Kaine when they couldn't reach Terri, and probably called police as well.
It's just a big puzzle to me. We're saying over and over again how unfortunate it was that nobody at the school realized Kyron was missing until hours after he was last seen. But an inexplicably long delay in noticing he was missing strikes me as having been an absolute necessity for Terri's plan if it involved killing Kyron and disposing of his body, and even a hand-off would have required getting to a fairly remote location and quite a lot of certainty that the the handee wouldn't encounter any delays or cold feet. And yet I can't see how she could possibly have counted on getting that long delay. Aborting the plan while Kyron was still alive doesn't strike me as a feasible Plan B, because he'd be able to tell people what bizarre excuse his mother had given him to "quick, come out to the truck with me, we have to go somewhere", and what she'd said to him while driving. Not to mention that she would have a heck of a lot explaining to do about why she hadn't mentioned to anyone at the school, or to Kaine, that she was going to take Kyron away from school that morning.