Speaking strictly as a layperson, there was one single piece of evidence that convinced me and it wasn't the hair in the pliers (I thought that was really weak, considering they were married).
The one piece of behavioural evidence that convinced me was when it was revealed that he bought a one day fishing license four days in advance of a fishing trip that was supposedly just a spontaneous whim. To me, that spoke to premeditation. If he'd spent the day with Amber, then I might have had some doubt about it. But he didn't see her that day, so what did he need to arrange an excuse in advance for?
So far, I haven't seen any evidence that strong in Kyron's case. Maybe it exists, maybe not. I'm a little cynical because in following cases over the years, I've seen too many LE agencies, up to and including the FBI, imply that they have a lot of evidence, only to find out it was an overstatement or bluff.
I'm starting to think that if Sheriff Staton is not planning to ask for any more money, either he plans to arrest TMH or it is a tacit admission the case has gone cold (in the sense of not enough evidence to convict anyone and a low likelihood of finding more evidence).
And... if there is enough evidence to convict TMH, then why hasn't she been arrested?