I wonder what the odds are that the perp drove by the Closs house or made a sorta dry run sometime over the weekend before making the real attack in the wee hours of Monday morning. If that happened, maybe it's possible that the perp's cell phone pinged the same cell tower that Denise's phone pinged when her phone was used to call 911. I'd think that the perp prolly wouldn't have brought his cell phone along when making the attack, out of concerns about technology exposing him to LE. But the perp, I'd think, very likely might have had his cell phone with him if simply eyeballing the house while driving by a couple times over the weekend.
Barron isn't a big place; perhaps LE, if it hasn't already done so, could take on the arduous task of identifying every cell phone that pinged that cell tower from say the Friday morning before the attack until the wee hours of Monday morning when the assault was carried out. Interviewing anyone whose cell phone pinged that tower over that weekend would seem like a productive step at a time when LE admits it is struggling for clues.