deSitter:
"yes I am aware of the notch taken out of the lower end of the rudder - something to be expected if the fin departed rearward in flight!"
Are you aware of the compression damage to the bottom leading edge of the VS? That indicates that the VS rolled forwards. If you theorise that the VS came off in flight, you need to explain a scenario in which the VS would be rolled towards the front of the aircraft as it breaks away.
You can see the compression damage on the photos in the interim report.