PJ2 wrote: "the most interesting parts I think are the two, intact overhead bin covers and the doctor's kit."
I agree with PJ2. These are examples (IMO) of items that investigators can look at and, surprisingly quickly, eliminate a couple of scenarios (re aircraft breakup). I would add that eliminating some possibilities DOES NOT infer being (lineally) any closer to "causes". It's simply how investigations proceed.
Grizz