So a possible Scenario remains: Something caused a rapid and massive excursion of the THS/Elevator. This causes the HS to fail. Aircraft starts to bunt over putting enormous load on the VS and rear fuselage, causing the fueslage directly aft of the CWB to collapse.
I think the same. Remarkable is the apparent symmetry of the damage overall. For me that speaks against a bomb, how probably would it be, that a bomb was placed in the center? (well, if somebody put it in the jackscrew or something like that, ok, but not if placed in baggage, loo, etc.).
I also think that the damage to the HS and VS could not happen once the tail was detached.