Enlightening to read all of your theories. Thanks, everyone, for your input.
IMO, I just don't see how TH can't be involved at this point. There has been turmoil within that household over the last six months. Her teenage son moves out (why? perhaps just to escape the madness). Affairs are happening left and right. She tries to hire the yard guy to murder her husband (Kyron's father). She is unstable, detached from reality, capable of causing violence (or attempting to) upon family members. And then...Kyron disappears. These are the dots for me, and they all point back to TH. It just seems incredulous that Kyron's disappearance would be unrelated to all that had been going on with that family over the past months.
Sadly, I do not think Kyron is alive. Whether TH harmed him in a fit of rage or it was more premeditated I have not yet decided. I can see both scenarios as being plausible. What I don't see as plausible is a 3rd party being involved, i.e., TH selling Kyron (to whom? how would she find such an interested party? over the internet? just like that? did she just walk up to someone on the street, figuratively speaking, like she did the lawn guy, and ask them if they wanted to buy her stepson?), TH handing Kyron over to a third person for safekeeping or to be killed (again, who? what would be the benefit to that person? who in the world would agree to such a crime? and why?), or a 3rd party such as the lawn guy taking Kyron for ransom (I don't think bungling criminals with that level of stupidity really exist outside of Hollywood B movies).
Following the principle that the simplest explanation is often the correct one, IMO I see TH killing Kyron either in a fit of rage or in a premeditated plot cooked up in the fog of mental illness/detached reality to hurt her husband or out of hate/resentment toward Kyron. Whenever anyone goes missing, adult or child, someone close to the person is usually the culprit, more than nine times out of ten. Although this case has some crazy components, I don't see it as being extraordinary in that regard. And a mentally unstable stepmother who tried to hire someone to murder her husband several months prior snapping and harming her stepson is much more likely, IMO, than a desperate, crazed, and bolder than bold pedophile entering an elementary school and snatching a 7-year old child without anyone noticing anything out of the ordinary.
All JMO, and how this will end remains to be seen, but I will say one thing I'm sure about - this case has only reinforced my extreme dislike of Facebook!! I'm proud to say I've never had a page on that site and never will. (What is this I read about Kyron having had a page on there? A 7-year old needs social networking? Aaaggghhh!!!!)