Ah ... let's just lump 'em all in!
I think they all know full well it will not be reopened. If Dina wanted to solve any mystery about Max's death, then she would try to find out if it was explainable through accident scenarios. I strongly believe that if a panel of experts were brought in, this is exactly what they would conclude.
"I think all of this malarkey is another giant, smoky, expensive, convoluted screen to get the focus off of RZ and the crafty suicide. JMHO!"
I definitely think that could be Dina and Nina's goal.