I can't help but think of Morgan's "discarded" T-shirt which may be the piece of evidence that linked JM to Morgan and the Fairfax victim. If JM is the one who placed the shirt in the bush, why? Was he mocking police? Why not throw it away? Why leave it out in the open? That shirt may very well lead to his downfall... I'm dying to know if he's the one who placed it (so very close to the location where he worked at the time and close to the location that HG went missing).
There's no way of knowing, but considering the timing, Gil Harrington's appeals may have had something to do with it. Those who were able to access his facebook page mentioned that he was following members of the Harrington's support group (no idea if that's credible). News of it may have been dying down and he may have wanted to spike it. I suspect ultimately, according to the great background material provided WSers, it wasn't about mercy but about him.