I do have other theories. One involves the tail strike @ ~100knots but in additive to horizontal, perhaps the same 100 knots. The VS keeps descending (!) as the tail stops, and pierces, extends into, the HS, where the lower corner of the Rudder is trapped between longerons (not for long) as the assembly "rebounds" (?) the Fuse keeps the skin, strips off the filleting and fairing as the VS ends up rotating slightly backwards, free and clear of the debris field.
Or, without ASI, no RTLU, and a sinister Ruddering as the pilot tries to correct for the last Yaw by increasing the next one, with Power and Pitch screaming at his skilled Brain, and loss, gain of thrust in asymmetric result, the VS and Rudder are torn away. We know how robustly the Rudder is designed and built, we see the "Failure" which isn't actually a failure. The VS? We see destroyed "Hoops". What is a Hoop? I have no idea.
bear