Did the SM take a poly (a 2nd one)? Dunno. We may not find out for some time. LE is not going to tell us.
This is what happens when there's no actual news on a case. Every word uttered by everyone even slightly peripherally involved gets analyzed down to the butt lint level. Misinformation abounds and then people react to anything they hear or read and run with it. So many people are projecting what they'd do if they had a missing child, how they'd feel, what they'd say. Okay, but how exactly does that solve this case?
None of it tells us what happened THAT day and to THAT little boy. Oh sure I suppose someone can infer the SM's state of mind (or at least try to guess from the massive amounts of flotsam floating about), but it (the gossiping) doesn't solve the case.
Frankly I don't know why LE bothered to hold any press conferences at all. They haven't disclosed any real info, they don't need the public's opinions, the crime is contained to that one school, that one day, and the police obviously believe it's someone either close to or inside the family. The rest of it is a bunch of psychological games being played. No wonder the rumor mongers are having a field day.
There is nothing for anyone else to do, save actually FINDING Kyron at this point. I wish all the gossipers would join teams and do organized searches of every single square inch within that entire county, which would be something useful for a change, rather than playing a form of 'Clue' (it was Mrs. Plum in the LR with the wrench! Aha!)