Here are some other facts that, looked at all together, drive more (wild?) speculation:

-Laundries said on 9/17 that Brian may kill himself. -The Laundrie red pickup truck was muddy and dirty as early as 9/14. -The red pickup had a tire repaired sometime in 9/13. -The Laundries have never shown the ‘expected’ emotion at any time since BL’s disappearance. -The Laundries have never made a public plea to Brian to come home/turn himself in.

Again, there is likely a good explanation for all of this. However, without all the facts, it invites some suspicion. My guess (hope) is the authorities are investigating or have already investigated these interesting circumstances.