Spin?
There is no where near enough wreckage for me to start concluding what the impact angles or energy may have been. However, there is one piece of evidence that has come in and must be taken into account. With the destruction of the aft pressure bulkhead I don't think it is possible that the impact of the tail was low energy. One POSSibility may be that the tail came down as a separate piece and the open end of the tube hit first with the hydraulic effect opening the pressure bulkhead and the bottom of the fuselage.