Vertical Tailplane Separation?
If this has already been reviewed, forgive me.
Is there the remotest possibility that the vertical tailplane separated due to an inappropriate full rudder input, while at FL350? (I believe the fin was recovered some distance from the site where the fuselage and wings lay).
This could account for the unusual oscillations and strange handling of the damaged aircraft. I have no idea whether the rudder inputs and outcomes were analysed on the FDR.
This is not a pet hypothesis, obviously, more a thought. Has this possibility been examined?