I have occasionally pondered the potential role that unreported rotor head overspeed events could play in setting the stage for these these mishaps. Given that there are no readily identifiable witness marks from such rotor RPM only events and likely some considerable residual stress fatigue, multiple events could be absorbed unbeknownst to mx and later operators until the catastrophic unexplained departure from controlled flight occurs. There no databank of supporting evidence and its not statistically quantifiable so its just conjecture. Thoughts?