The point Barbies Boyfriend is trying to make is to add some objectivity to the debate.
It is that very absence of material evidence that indicates the apparently unthinkable conclusion that he identified in option 2 and, to quote a phrase that's been bandied about recently, it is clearly "beyond any reasonable doubt" that this accident was CFIT. There is not a shred, not the tiniest shred of evidence to suggest otherwise. It is the only credible explanation.