I have thought from the first day of this case, that everything is consistent with a burglary gone wrong. If MB was targeted, then suspect went through a hell of a lot of unnecessary work. He could have just ambushed her outside when she got out of her car, shot her, taken her purse and made it look like a robbery. There was no need for him to break into the church and spend 45 minutes vandalizing the place. He could have been done with everything in five minutes.
The process of elimination just reinforces my belief. All known persons have airtight alibis, and if tIhat was a hit man, then he was one of the most amateur hit-men ever. A professional hit-man would have wanted to kill her quick and get the hell out of there.