In this instance my money is on the in -flight loss of the empennage as a result of aerodynamic forces imposed upon it beyond its structural limititations
Basic stability means there is a downforce on the horizontal tailplane.
By definition therefore, if the horizontal tail is lost (as you say), the aircraft bunts - hard. Significant negative 'g'. In turn this would likely lead to a very high speed, near vertical impact. Not sure the wreckage supports that at all?
In fact, loss of tailplane can impose sufficient negative g that the wings then fail.