Please don't mistake my pointing out the fact that he has not been legally charged with kidnapping, etc, as my way of excusing his actions prior to or during this situation. With that said however, there have been quite a few theories postulated that could explain WH "inserting himself" in to the investigation that are essentially him believing himself to be smarter than the police and taking the law in to his own hands. They are just one explanation and not the most obvious one, however, when everyone in the group starts to buy in to and believe the same story, keeps saying it over and over again, it makes it that much more difficult to look at other scenarios.
My point is simply this--while it's convenient to blame WH for everything, there's nothing specific, other than his past, that points to him directly. I could just as easily state that JH's behavior is indicative of someone who knows what happened, could have been a party to it, and thus would explain the lack of searches, going to ODU basketball games, yelling at the news, and a lack of pleading and begging in front of the cameras for her daughter's safe return. It would be very easy to make a leap, but that's not happening, because JH's past isn't public record and therefore her behavior is not as easy to explain.
The pressure on him should be increased, absolutely, and police should certainly be very interested in everything he did, everywhere he went, and everyone he talked to leading up to AJ's appearance. But he should not be the only person examined or the only scenario followed. If it were that easy to prove him guilty, police would have called him a POI and/or issued a warrant for his arrest already.....