It's not for me to speak for Mr Walker.
I fear that the debate above about 'command' is unhelpful. Perhaps Mr Walker might comment, if he is visiting here.
My perspective is that there is much more to be gained for the public good from an examination of the activities of an individual who was not on board the aircraft, but who was already 'known to' various organisations, and whose reputation precedes him.
I trust that HM Coroner will be adequately briefed. I also hope that he exercises his considerable powers to their full.