Likewise, my condolences.
An understanding of what went wrong can be an important part of dealing with a tragedy.
The AAIB are a diligent organisation; we all await their report.
Perhaps best to bear in mind that a fundamental part of their processes is to treat the statements confidentially, utterly confidentially. That way, people feel free to speak the truth, admit mistakes and so on without fear of retribution or legal consequences.
That said, from the very little I have heard of this accident, witness statements sound unlikely.