If the recording channels have sufficient bandwidth such that the rise time of the received signal isn't characterised by limited channel response, the difference between a 'pyrotechnic' and decompression event will be very clear.
From all the discussion here, I didn't see anything clear about the separation of the rudder and HS. Is it possible for aerodynamic loads alone to shear these off if at an adverse attitude to airflow?
Pax only.