I am going to forget most of what we "learned" from the SW dump yesterday and go back to my theories that I firmed up a week or more ago, developed when we were watching the videos.
IMOO......
I think the perp we are looking for has LE experience---that could be present cop, former cop, reserve cop, or military training.
I think the perp is not young and inexperienced. (i.e., I discount the impetuous teenager theories).
I think the perp would have to be fit enough to (potentially) chase MB down, tackle her, and hold her down long enough to hit her in the head, face and chest with the hammer (or other implement).
I think the perp is familiar with the church, but not so familiar that s/he knows where to find the video recording equipment.
I think the perp is familiar with MB's routine.
I think the event was carried out with the precision of a military special-forces operation.
Now, only one person mentioned yesterday fits that profile, as far as I can tell. Not saying it is him, not saying it is not him. But that's the profile.
Again, MOO.