There has only been 2 people questioned by the Police (that we know about) - both BR and AR.
Motive, means and opportunity could be found for both IMO - given more info.
The question of "Who would benefit?" is the main question for me.
BR wouldn't benefit financially for years to come - AR's benefit, well his 15 mins of fame perhaps? A start to healing? A relationship with his father? (Doubt that one)
Neither would have an immediate benefit IMO.
It's possible that the only short term financial benefit would be to one of the businesses.
IF and I would say it's a big IF - any of their business had taken out a 'Key Person" Insurance Policy on Karen, it could be possible to make a claim. The Company would be the beneficiary not an individual (but then there is creative accounting :thinking: )
Key Person insurance can be taken out by any business to cover illness, death, incapacity etc of any person deemed to be important for the business to continue to make profits. The actual Policy wording itself would have to cover "Losses related to the extended period when a key person is unable to work" to cover a missing person I imagine. Even though it's a long shot, it's not impossible and it wouldn't take as long to claim on the Policy.
https://en.wikipedia.org/wiki/Key_person_insurance