While I am now on board with your ideas of where she may have been attacked and found, I am starting to doubt LEs statements about what was caught on camera. When I look at the short MPD videos (the zoomed out versions), it really looks as though the cameras can see all the way down the hallways. I agree there may be some far edges where motion would no longer be detected, but anything within the primary view (most of the entire hall) should trigger enough pixel change to keep recording. I will buy that an open door could cause issues, but that seems like you would still see her walking, then get immediately dragged out of frame or something. You can set cameras to ignore motion in specified areas of the field of view, but I can't imagine they did that for a church. Why tell them to ignore the ends of the halls? I also assume if they had a technical glitch they would have mentioned that they didn't have the attack on film due to some technical malfunction. I have watched the film over and over, looked at all the maps, and I just can't figure out how to align what they said MB did, where she was found and what should have been on camera if it happened as they stated. The only other option is back to the bathrooms. I guess if she pulls up, headlights trigger motion and record her walking in the door where she immediately turns left and then is out of view - but that is a pretty liberal interpretation of "we see her in the video. She's walking down the main hallway in the vicinity of where we located her". That means her walking down the main hallway is all of 1 or 2 steps once inside the door.
1 You observe what should have been, as to cams and videos, and I agree. But the case is stuck with what was, on that day.
2 It's possible that CCoC thought they had better coverage than they actually did, but never had any real situation to see how it worked in real time.
3 LE did say there were tech issues (using the term technical or technological, I don't recall which) and maybe I saw intermittent or malfunctioning used too (I'm too short on time to research quotes, at the moment).
4 And like you, based on the other video we have from cams c1 and c2, I can't rationally fit that path with LE words, nor see anyone getting into and out of that restroom area unseen by cam.