Report
Chronus
I think that the investigation did examine the possibility and their (justified) conclusion is that weather played no part - i.e. FDR parameters did not show undue turbulence, which would have shown up as choppy acceleration traces, etcetera.
No, they were not amateurs, on the contrary, they were professionals. What I get tired of is seeing colleagues letting slip aircraft from their fingers time and again for no good reasons.