Well, Gerrold was there and neither of us were. I figure that he ought to know how things went.If you find this completely impossible, so be it, but as to the "documentation" Gerrold's memoir of the writing of his episode would hardly qualify as an objective account.
Like you, I will drop it after this post. I will just say that if Coon did anything close to the rewriting you're describing, the writing credit for "Tribbles" would likely read something like, "Story by David Gerrold, Teleplay by David Gerrold & Gene Coon," but they don't. Instead, we have this:

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