This case crosses my mind frequently, still.
I am still certain on the area I described, and the feeling or impression that I get is that the step-mom and her friend, who resembled each other at the time of Kyron's disappearance, are responsible. The two white trucks, two redheads, and the different areas they were seen in all seem to be ways to mislead anyone trying to find out the truth. This theory keeps coming to me: Kyron's project was on the Red-Eyed Tree Frog. What if....he was told that there was a place close by that the frog had been spotted, and wouldn't it be great to have a live frog to show at the science fair? And it wouldn't be very far away and they could go get it and be back before the fair started? He would willingly and excitedly go with them to catch a frog. They get to the area I described earlier, where the "other" redhead was waiting. Little Kyron goes in search of his frog, gets separated from step-mom, and both women play sort of hide-and-seek with him, getting him lost. Then, (this chills me to the bone) they either killed him there, or left him and he was lost. :