At this point, regardless of whether or not Terri is guilty, I doubt the ability of LE to solve this case. IMHO, if Kyron's body is found and he is in a container that can be traced to the Horman home or to Terri (or anyone else) through receipts, then that may help solidify a case against her and/or the perpetrators of this crime.
We know LE do not have evidence of a murder, so either Kyron is alive and being held against his will somewhere, or he is deceased and there is, for now, no evidence to link Terri to his murder. If Kyron is deceased, then a murder scene exists somewhere, and the longer evidence is exposed to the elements the less likely it will be of any value in prosecuting this case.
I also wonder why LE, DY, and TY so strongly believe there has to be an accomplice. This scenario is nearly unfathomable to me. My rationale for them so strongly believing this possibility is that Terri must have passed, to the great surprise of everyone, some key portions of her polygraph directly related to Kyron's abduction and welfare. I've always strongly believed Terri only failed the portion of her polygraph that related to where she was that day. I'm sure LE asked if she abducted and harmed Kyron, and it is my belief that at minimum, she did not show deceptive with regard to harming him, which explains the insistence of LE, DY, and TY that Kyron is alive. If they are convinced she set up this abduction or carried it out, then they'd be convinced she knew of his welfare. Her polygraph must indicate she was being truthful about not knowing if he is deceased, which would explain why DY and KH are insistent that he is alive. They trust the polygraph about her deception, which I am convinced has something to do with her whereabouts, so it stands to reason that they would trust it if she showed truthful about Kyron's welfare. And, yet, this polygraph evidence makes zero sense to me. The only way I can explain it is if she is innocent, she lied about her whereabouts that morning because she was fearful about what may have been revealed, and she's held onto and continued to protect the lie for whatever reason. It is so improbable to me that there is an accomplice.
This works out only a few ways in my mind -- If Terri is a sociopath, how could she pass the "What happened to Kyron?" portion of her polygraph but fail the "Where were you that morning?" portion? If she's guilty, either she completely fails because she's a liar but not a sociopath, or she passes everything because she's a liar and a sociopath. So, then, I have to question if she's innocent. Then I have to question if Terri is lying about where she was that day, or was she so nervous that she showed deception but she was telling the truth. Is there some other reason for the discrepancy? Or, is she lying about where she was, but telling the truth about not harming Kyron? If she didn't harm Kyron, is she guilty of his abduction? Which leads back to the accomplice theory.
Are LE, DY, and KH convinced there must be an accomplice because it's the only scenario left in which Terri can be guilty based on the evidence they have?
If she's telling the truth about not harming Kyron, then where in the hell is this child?