Not wanting to be pedantic, but the phrase Run-Dry is misleading and not a term used by the regulatory authorities.
The loss of lubricant guidance of AC 29-2C does not require the transmission to be empty of oil, as the test allows for a predetermined level of residual oil to be left in the transmission during the test, so most certainly not Run-Dry by any standards.
If you assembled a MGB using just a light lubrication of all the contact surfaces, bearing and gears etc. and performed the loss of lubrication test required by part 29.927(c)(1), I’d bet my shirt that there is not a helicopter MGB out there used for commercial operations that would pass the loss of lubrication test.