ttcse,
Any guesses where the 'torsional' component of separation for the vs came from?
They could come from whatever twisting forces. During an impact, you experience tremendious forces, and the tail is the last one to get them passed on. They could also be in a slight turn.
The report says: "The distortions of the frames showed that they broke during a forward motion with a slight twisting component towards the left."
So, if they are right, the forward motion is bigger than the twisting. That couldn't be the case if in a flat spin.
Anyway, the discussion about spin or not is useless. Because it doesn't deliver a theory about the cause, only about the outcome. We are not interested how they crashed, but why they did (Boac, you remember our discussion in the THY/AMS thread?)
Dani