"Even when special expertise defines who is most likely to develop fixes, the big picture view sometimes only afforded to outsiders is important, or sometimes just enough disruption so different voices within the system are heard."

Yes! This is not unlike having a child solve the problem of the 18-wheeler stuck underneath a too-short overpass. Have outsiders review the data, the situation, suggest possible causes and solutions. This extends to so many venues, IMHO, beyond accidents like the Challenger/Feynman, Chernobyl, Fukishima and Asiana Flight 214. Some of the most successful and impressive businesspeople I have know are those that discuss their work with outsiders openly, and really listen to what the outsiders have to say.