Walter, an additional inquiry could produce lots of detailed theories but in the end it would solve nothing. It doesn't matter what any number of experts say about the situation - the only 'horse's mouths' that matter cannot give evidence because tragically they are not with us to do so.
Any evidence from any other source is still only speculation - and under the rules in force at the time of the accident, because the crew were not alive to present their case, that was not good enough to determine a finding of gross negligence.
The original Board got it right and the 'powers that be' ignored their own rules to find otherwise. It is an absolute scandal that this is still rumbling along but all power to Brian and the others in their fight for justice for the families
S&S