Well, from what I have seen from the video and what took place at that church MPD should be looking for someone that is intelligent, confident, disciplined, cool under pressure.
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They define goals. Research and plan, as best they can, the steps and milestones to that goal. Then get to work gathering the tools they need and go about executing the plan. They don't fear failure. But they don't gamble either, unless they have to - least risk is first choice. They understand risks, calculate them, and move forward or stop based on that. They understand how much of each step of a plan is controlled by them and how much is controlled by others.
They never start something and never finish.
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They are cool under pressure, and aren't rattled, but they do react. They would act to re-establish control if possible or stop (or get out) if they believed they could not. They have experience in such situations. They certainly have trained for them.
Control is their dominant (or most valued) asset (possession). They aren't a control-freak. They don't lash out or go all passive-agressive if they don't get their way. But they are organized. Their home is order. Their financials are in order. They don't go out to control others. Their other assets - intelligence, discipline, cool under pressure - are subordinate tools leveraged to support and maintain control.
They are familiar with tools. They have either used these specific tools before or they have used tools, and used them properly throughout their life. They may have experience with remodeling, or even some construction or demolition work, maybe on their own home or a previous one, family farm, something like a Habitat for Humanity, or perhaps mission work - especially where access to the best tools may not be possible, so able to work with hand tools proficiently.
They aren't squeamish. I haven't gotten into my theory of how Missy was killed and the aftermath but it couldn't be done if they are squeamish. I am unsure whether the person has killed a human before, but they have killed other animals. They hunt.
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While their quarry may know the place better they have the element of surprise. They have the initiative. And much like a hunted animal, the victim is unaware of the box they have been placed in.
There was much said on here about the gear. From it being motorcycle gear and/or various pieces to make it look like tactical gear. I believe it to be actual tactical gear. I don't believe it to be cheap either. As I said earlier, they identify the equipment they need to do something right and get exactly what they need. Same with the breach tools and other tools. This might very well might have cost $1000-$2000 or more. So they have money. They aren't fabulously wealthy but they are nowhere near hurting. They are disciplined savers. Not exactly frugal, but then again they buy what they need and nothing overtly extravagant. They have cash on hand. Probably what would be a large sum to most of us, say $2000 or so (perhaps a little more) in small bills in a safe in their home maybe even some precious metals. <snip>
The goal was to kill Missy and the money necessary just another tool to achieve the goal.
I believe that it is possible the date Missy was killed was not the original planned date. That it is possible it was moved because the circumstances surrounding the week leading to her killing presented a better opportunity. If I had to suggest a date, perhaps May 6th or May4th or even May 9th based on the phases of the moon. I believe that the person(s) arrived and left the church location on foot. You can't predict the weather that far in advance but you wouldn't want clear skies and a bright moon.
So, this is some of what I think about in terms of the kind of person could commit this crime the way they did. Hopefully, MPD has considered all of these.