Flying wires
Having read most of the posts re this accident, I find it strange that no one has mentioned the integrity f the flying wires or should I say their attachment points.
My own experience is limited to~500 hrs on DH82 and Stampes, some 40 odd years ago but due one fortunate ground incident, a/c tied down securely overnight caught in a squall and ended up inverted on top of a Cessna. The rope was still secured to the a/c tiedown fitting but the bolt either 3/8" or lighter had corroded away out of sight holding on by one thread. On further examination most of the other similar fittings were also well corroded. Including the ends of the flying wires.
The interplane struts and their fittings must be the weakest points as most connect through a single bolt (from memory) the video will hopefully show the moment of disintegration.
My condolences to the families. SW.