MPD, in answer to a question about releasing more footage, on their own facebook page said that they have released all the video they have of SP. The only remaining piece of video they did not release that they claim to have is Missy entering the building and walking in the direction SP was last scene and then she went out of range of the camera. After that, was her murder.
So the conundrum is, how is that SP got so lucky that the very spot of the murder was not on camera, that they were able to get out of the Church unseen on video, that they could get from the Kitchen (the last door we see them enter in the opening sequence of the long MPD video) and then next be seen in the Main (west) hall, get into room 12 unseen, get into the room further down the hall unseen, smash the glass on the Northeast vestibule doors without being seen coming toward either of the cameras at that corner of the building both of which recorded SP in the video. I can't believe that is pure luck. That somehow, it just so happened to all fall in their favor, not just once or twice, but seemingly at every single place, every single time.
And not only that but that we saw the first time stamped release. It was 3:59 when they only started down the South hall to the Dutch Double Door room and then the next door down, and then sometime after materializing in the hall coming back down the hall to the auditorium, off to room 12 and the room down the hall, and still get back to where Missy was killed in 19 minutes or less later. A lot to do and so little time. Yet, seemingly going about their tasks and checking them off the project plan as they were done.
It is my belief that they knew quite a bit about the church and its layout. I believe they knew what cameras were in the church and where they were located. I believe this was planned and executed A to Z, in order, almost flawlessly - I believe they only made one mistake in the church.