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What else did she carry into the church that day? Did she have her hands full of workout equipment like mats, kettlebells, audio equipment?
I have also heard the glass aspect mentioned several times. I have wondered if glass was broken in the vestibules from missed shots at Missy, although we do see the killer breaking glass in the hallway that leads to what looks like a storage closet.
I have also wondered if the SWAT person was actually trying to pry that door, or was just using it as leverage to steady an object in their hands. I think it was LordonArts who was confused as to why they would try and pry the opposite direction of the hinges. I think it is possible this person was manipulating an object in their hand and was using the door crack to steady one end and their hip to steady the other. So instead or putting it on the ground or on a table, they were using the door and their hip as leverage. I have always found it extremely bizarre that this person swipes the top of their crowbar/object with the hammer in a motion like they are flattening the surface or wiping something off of it.
If its true that Missy's death wasn't caught on camera, this is really tough news. We don't get to see if the killer is hiding in wait, we don't get to see if the killer is startled, and we don't get to see exactly what happened to Missy. There is the controversial gunshot wounds theory, that no one can ever seem to provide a direct link to for proof. I have also wondered in the "puncture wounds" were bullet wounds and/or the killer used their tools to try and pry the bullets out of her body. I have also wondered if it could be something unusual like a crossbow arrow, harpoon, handmade gun, hydraulic press like No Country for Old Men, etc.
Even if Missy's death was caught on camera, it may not give us all the answers. Liz Barraza for instance. She is seen being shot and confronted, but the killer did not give her time to react to what appears to be a note or phone extended in their left hand. Liz takes a HUGE step back, then leans in to see what is extended to her, that's when she is shot. We don't get to see her body language like "whoah! whoah! that is NOT me!" or "ok, hold on. I can explain. It was a one time thing/i didn't know (insert something bad)" or "seriously? THAT? cmon now grow up!". I think body language in that case would offer more clues, but we don't get the chance to see it.
My theory for Missy is that she was a victim of a very well thought out plan. She was stalked in the church and the SWAT person was looking to see where she was going to setup. I think they entered through the kitchen because they couldn't account for how Missy would enter, kitchen being the most logical place she was least likely to enter. I think the killer didn't just shoot her in the parking lot because they were not 110% sure she didn't have her daughters in the car, Missy could have access to her gun, and the car offers a layer of protection. Her becoming a moving target with a gun to shoot back could turn disastrous quickly. I think they decided to attack her in the church because it was very unlikely Missy would have her gun, and likely Missy would have her hands full. I think the SWAT getup was for identity concealment, keep forensics off, add a layer of protection, and throw general chaos into the case. This is just my two cents in a short wrap up. I think this person knew Missy very well, was close to her age, and was a female. There are 3 very particular females I suspect, and Missy's MIL is NOT one of them.