check out the photos of the almost 'unrolled' fuselage sections posted on 5th Nov @ 19:19 ...
"Unrolled" fuselage is not relevant, since the aircraft at cruise altitude(inflated state) behaves as a punctured balloon.
At 90% level of confidence, the investigators might heard the explosion blast only which was not preceded by any decompression sound (structural failure). The rapid decompression sound is very distinctive, in video below at 0:33
https://youtu.be/m24Gr67i_7o?t=32
The explosion was not after PSB either, since the back box looks pretty good.
With, rupture before PSB, the tail should come down in one piece (including HS and rudder), since free fall doesn't exceed 120 kts < cruise speed < VNE.
We are still missing serious forensics expertise.