To address the neighbors:
They are a middle aged couple, dealing with the guilt of not calling 911 when they heard what they believed were gunshots.
At the time, they obviously weren’t overly concerned by what they heard. By now, they realize that they made a grave mistake.
They are being hounded by the media, and there is no playbook for how they should be behaving. Everyone reacts differently to stressful situations.
They may have been inconsistent, and said things in a way that people don’t like, but that in no way indicative of them being involved in anything nefarious.
The timing of this event is thrown off by their statements, and I can’t make sense of this crime, in part, because of the time gap between gunshots and 911 call.
I believe that they are telling the truth though.