This is how I look at it: If Terri sold Kyron to a sex ring, then he's probably not going to the local school district wherever he is. I also cannot see her selling a 7-year-old to a couple that wants a child, unless they want a child for sick, perverted reasons. If Kyron was 7 months old, then I could see it. But 7? I find it very unlikely. Now, I suppose there is the possibility that Terri sold Kyron to one individual who has been abusing Kyron since June 4th. I don't know if that person would allow Kyron to go to school, play outside, etc. I believe that Steven Staynor went to regular school but I don't think Jaycee Dugard did. However, I can't think of one case where a relative sold a child to a sex predator, and the child was kept alive. Shaniya Davis was sold, but she was murdered. It seems that in almost every case of a child taken by a sexual predator, the sexual predator was the one who took the child, and the family had nothing to do with it.
I also agree with you that if such a "transaction" took place, there would be phone records, internet records, etc that would document it. Like you said, there could be, but LE has kept it secret. But I feel if they did have proof to show that Kyron was currently with a sex ring or sexual predator, then it was extremely irresponsible for LE to allow the parents and themselves to indict that Terri, was 100% behind Kyron's disappearance, because then people begin to think that this is an isolated incident and they stop looking for Kyron everywhere they go. This isn't like Madeleine McCann, where everyone was told to look for her unique eye. There's never been a huge urgency for everyone in America to look everywhere for Kyron. It's always just been, "Terri did it!"