Good point. If Missy is your target, why be complicated by dressing up as SWAT member and break into a church. Just keep it simple and drive up and shoot her. Between the early morning hours, the rain and isolation of the church you could have used a .38 Special or .45 ACP outside and few would even be awake to hear it. Those that did would likely be inside their homes and not be able to tell from which direction the shot came from.
Except that, that 'keeping it simple' would narrow the pool of suspects considerably. Investigators would assume then that she was killed by someone laying in wait for her--a definite targeted hit. That would narrow the field down to those with a grievance, logically making the killer easier to discover, consider, and investigate.
If a killer intends to kill someone--IF this is a targeted hit--and if this killer is also smart enough to know at least the basics of how murder investigations work, such a killer would be smart to:
1. Confuse the scene of the crime (he did, with multiple unnecessary exterior breaches--kitchen window, kitchen door, and rear NE glass doors)
2. Confuse the suspect pool (he did--2 years later people are still thinking there's a chance this was an attempted burglary because it was done on a post-collection Monday morning. No matter that nothing was taken or even stacked by the door by said "burglar" during the time he casually roamed those halls). Shooting her in the parking lot would cement the fact that this was a targeted hit; pretending to be a roaming, vandalizing wannabe-burglar intruder muddies things (even though in the end it makes sense ONLY as an intentional decoy maneuver).
3. Completely cover up head to toe to prevent DNA or any other identifying factors coming into play, also ascertaining what surveillance might be in play. (He did.)
4. Kill Missy and make his exit FAST, within a tight timeframe, minutes before potential witnesses might arrive (he did).
JMO, but I think if LE are going to solve this case they need to dig deeper into the 'grievance' pool. And perhaps also use some fresh eyes NOT necessarily previously involved in this particular investigation.
On a personal note, I am concerned that of the 2 LE individuals I drummed up the courage to contact in 2016, one was "reassigned" and the other has simply disappeared--I can no longer find him affiliated with this police force. [*Let me emphatically insert, I have no inside knowledge, so nothing to share here--only some documented hunch-work, so nothing to even PM about.] This LE reassignment or disappearance could be just chalked up to some unfortunate but typical LE turnover, but the longer this case goes unsolved, the more I have sometimes wondered about the continuity, teamwork, and communications between the many investigators. (Eg. I confess I sometimes still puzzle a bit about why one requested I send him copies of what I'd given the other several days earlier--they're in the same force; can't they just forward this stuff to each other?) I'm probably head-scratching over nothing, though, and maybe it was simpler for them for whatever reason, or perhaps even a necessary and good checks-and-balances thing. Just doing some frustrated musing, here...