I used to comment frequently, but haven't done so in a while. There's just been such long stretches in between real news about the case. But this article is the most interesting thing I've seen in a long time.
He definitely underwent some traumatic experiences in his own right, so it sounds like he's pretty disturbed.
He's a sex offender who seemed to be acting out in more noticeable ways over time.
He lived in the general region.
He fits the physical description.
He has a history of acting out in rage (which is something I suggested the Delphi suspect may have done in many comments, though several disagree with me on this).
He had access to a gun he could've used to scare people or hold them hostage. He had a machete.
He seemed to be growing more protective of his wife--didn't want her to talk to family or use social media. Was he trying to keep her from seeing news about the case?
Does the "down the hill" audio suggest a southern drawl like the wife described?
He could still be just a concerning individual with a temper who has nothing to do with Delphi, but there's sure enough reason to dig into it a little bit just in case.