You miss the point....using Glycol is not the same as a genuine Run Dry capability just as assuming there shall always be some trapped Oil in the Gearbox (such as in the S-92 original assumptions).
The goal would be to have a gearbox that can be run at Cruise Power for 30 Minutes with no oil, glycol, or fluid of any kind.
The question I would pose is what does the Crew do if there is no landing site within that 30 Minute Range and the Sea State exceeds the Certification Limit of the Emergency Floatation System particularly in very cold air and water temperatures and rough seas?
Why have a 30 minute run dry time if a safe landing (Ditching) can be made and SAR resources are available to retrieve the Crew and Passengers in a timely manner?
Are we perhaps chasing the wrong Horse?