I would like to offer my observations and opinions on the perp video:
1. It is indicated via LE that the perp parked at the far end of the parking lot, in an attempt to be out of surveillance of the outside church camera = the perp knew the camera would not cover that area.
2. The perp broke a window frame and entered by prying open a door = this takes physical strength to accomplish
3. The perp was not concerned of a silent alarm upon break and enter=
familiarity with security measures at the church
4. Sauntered about in a slow and clumsy manner = aware that a period of time must pass before MB is to show
5. The disguise used is bulky and uncomfortable and heavier clothing than the perp is accustomed to wearing, sometimes unsteady on feet/stumbles due to the extra weight = Not an actual police officer, as one would be accustomed or having experience in wearing Tactical Gear.
6. The perp stops and looks at what seems to be a Community Bulletin Board with activities listed = a hired hitman would not be distracted by such a thing and would not wear such heavy gear to thwart their own escape - therefore lends to familiarity with the church/possible congregation member
7. The exaggerated stride and the 90 angle of the right foot seems forced, as other times the foot is not in that position while walking = purposely changing natural stride and manner of walking to further thwart video footage to be recognized as someone known to that church.
8. Bringing a hammer/pry bar/blunt object to accomplish the killing = a hitman wants a clean shot/hit, this form of weapon would be inefficient to get the job done therefore a first-time killer
9. The use of a blunt object to murder MB was one that is personal and messy = the perp knows the victim well and has animosity, anger, resentment towards the victim
This is my run-down thus far. Let me know your thoughts.