You can't force yourself into a mediating position, nor is mediating by ultimatums likely to be productive. You're supposed to be investigating.
You're right.
I am officially dropping this investigation and am releasing all parties of any obligations. BadBear will now decide this, if he wants.
For what it's worth, I think declaring this situation to just not be resolvable by the forums "scammer tag" mechanism is a reasonable resolution as far as the forums goes.
Hopefully GLBSE's future customers will take into account the fact that GLBSE reserves the right to totally abandon its obligation to preserve their ownership interest by making a decision to delist the asset and will exercise this right if it feels like it with no obligation to explain or defend that decision.