I am completely on board with HW being the catalyst... but I keep coming back to the BMW. 18 year olds don’t just give their parent a car.
What if EB was killed in that car, by that car, transported in that car by MB. MB then decided to try to pin this on her mother so HW and MB give her mom the car with all the “evidence” (unbeknownst to her). Then, a few days later they have it reported stolen by his mother, hence having AB caught with the car and looking guilty.
I’m assuming the car has been searched for forensics though. I think we would know by now if anything pertaining to Evelyn or her DNA were found in the car.
Ugh. Trying to figure these people out is exhausting.