Whoever did this crime knew that Missy would arrive first, early and alone. He/she knew that others would not arrive at the same time as Missy but rather would arrive some time later - 1/2 hour or so. So, he/she knew this Monday morning routine. This to me, is critical to solving the case.
Just how many people would know this information? Not many. In fact, in all likelihood not even the whole camper class would know what time she arrived before class, or how much time she spent setting things up and what time other camper/early birds would start to arrive. Just a few would know. Very few.
Family, very close friends and helpers would know. I have taken many classes and had no idea what time the instructor arrived to set up or what time others began to arrive - only perhaps that they were there when I got there or came in after I arrived. The perp knew there was a window of opportunity to act.
Was there someone who continued to volunteer to help her set up in the mornings? This person would know that there was no need to disarm any alarm system as he/she had been there during set up time before but perhaps was not a welcomed assistant?
While this may be a jealous lover/spouse/whatever situation the perp HAD to know the early morning routine to be able to judge the timing of the murder and get away without fear of having campers stumble upon the crime in progress. The calm strolls through the church tell me that the perp knew precisely what time Missy would arrive and was not hanging out looking through a window to see her arrive. IOW not worried about her coming in too early or being accompanied by other campers.
This person didn't just know that Missy would be teaching a class at 5am but that she would arrive around 4:15am and roughly 20 minutes before anyone else would drive into the parking lot.
BB stated that Missy touched a lot of people's lives in meaningful ways as she helped them realize their physical potential and mental strength. We may have someone who latched onto that kind of attention, had fantasies that this was more than a professional relationship, had found meaning in life through Missy and when the attention was not reciprocated - bam! "You lead me on!" You know the type and yes, it could still be a woman.
JMHO