Something else to consider is that historically [not saying it's the case here] when an aircraft is prepped for a flight to the boneyard, especially to meet the ax [vs flyable storage] they are often stripped to various degrees and also low time/cycle components are removed and replaced with high time/cycle, sometimes nearly run out components.
As an example, I know of a flight, many years ago, where a ferry crew delivered a 4 engine jet airliner for demolition. Besides being prepped for its 2 Hr last flight, it had been stripped to the point of being a lighter weight than even the factory had ever flown one; so the crew had to extrapolate data... And flying with essentially a ferry kit of instruments.
Apparently this accident aircrew was very experienced, as is typical of these sorts of flights; so I am of the opinion that this was not likely pilot error, more likely something they did not have the ability to deal with.
God bless this crew, and all of our troops...