About the parking by perp, imo the logical guess is he parked in the back (in relation to the highway), which would be the E side. Parking on any of the other 3 sides would have allowed his parked vehicle to be observed from the highway. If he had been parked anywhere else, MB should have noticed the vehicle as she entered the property and left, but that didn't happen, further evidence that he likely parked out of sight.
That's also the simplest explanation for why he didn't try all the doors - he was parked on the back side, in a big rain. That NE door had damage but was not opened, and I would guess perp tried to breach it, found it too tough, and went to the next closest door, one that he had driven by (kitchen) and might have looked less secure.