I'll backtrack a bit here.
Well;
Clifford Stone did not uncover the truth about Project Moondust and Project Bluefly; that had already been done by 1979 by Robert Todd. Stone was probably not involved in either project as he was in the Army and they were Air Force projects, designed to recover Soviet spacecraft or any other non-US debris. Therefore Stone almost certainly did not aid in the recovery of any extraterrestrial artifacts of any nature, and is almost certainly a complete fantasist. UFOlogy is full of 'em.

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Orion's Arm . The Starlark . Voices: Future Tense . OA Flickr set

I'm asking you to define what you mean when you use the term "UFO", in general...

See this is the reason I'm a firm believer in the use of "UFO" (Unidentified Flying Object) to merely mean an aerial phenomena of unknown origin and the use of "ETV" (Extraterrestrial Vehicle) to describe an assumed ETBE (Extraterrestrial Biological Entity) craft.

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Howling from the Shadows

It must be fun to lead a life completely unburdened by reality. --- JayUtah

You can't reason an irrational person out of an irrational belief. --- Noclevername

Apollo: The History and the Hoax
Enter the World of Athran

But that's very important information. The longer the time elapsed between interviews, the more likely the information is to change. If the second interview was more than a year after the first, the person is far more likely to have been influenced by other witnesses, TV shows, movies, etc.

It's more specific than that. If one person says it zig-zagged across the sky and another says it flew straight, that's two different versions. If one person says it was grey and one person says it was cream, that's a minor detail that helps show they aren't copying their stories from one another. If one person says it crashed in one state and another says it crashed in a different state, that's two different versions. If one person says it crashed a few yards--or even up to perhaps a quarter-mile--away from where the other person says it crashed, that's a minor detail. Do you see what I mean?

No. Not at all. It's an attempt to give you a lesson on how memory actually works. Tiny details like colour, distance, and even size (which depends very much on perception unless you have an actual way to measure it) and speed (ditto) will vary. That's human minds at work, and if everyone says the exact same details, it's suspicious. Then again, if they give wildly different reports--states away, military presence or not, straight or crooked path--that does tend to devalue the testimony as well.

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Gillian

"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"

"You can't erase icing."

"I can't believe it doesn't work! I found it on the internet, man!"