I sympathize with your stance . You're waiting/wanting for someone to come DISprove fibers. Or DISprove gold links. Or DISprove some uncanny suspicious triangle or non-native tree. Or DISprove the original story. Or to concisely prove the origin of 17th century bones at a certain depth, when and how they got there, and to "prove" that they don't mean "treasure", Etc...
But can't you sympathize with the skeptic's dilemma too ? That in all the above cases, it merely is pointing back to the legend as proof of the legend ? It would be like if I claimed to know someone (via a claim I'd heard 3rd hand via stories passed on to me), that there was a fellow who'd seen a unicorn, and then walked backwards from New York to San Francisco. And then triumphantly challenged you to disprove the story. YOU COULDN'T . Any "more plausible explanations" you could propose, could be dealt with in the same game of wack-a-mole we're facing.
eg.: You: "But unicorns don't exist" Me: "prove it". You: "Because there's no evidence of currently living unicorns on earth" Me: Perhaps they hide whenever photographers approach (and then I'd give the example of certain fish, thought to be extinct, yet were found this century).
Thus can you sympathize with our position, that ... we certainly WANT to enter into a logical look at the salacious details of the legend. But we KNOW that it will immediately devolve into a game of wack-a-mole. Where ANY remote far-fletched contingency of how something *MIGHT* be true (given enough slaves and enough year's time), will therefore be a failure, on the skeptic's part, to have shown anything.
If you doubt this phenomenon exists, all you have to do is go back to some of the early threads on T'net about O.I, and you will see some that descended into multiple pages of some of the sillyest of details. Eg.: Ocean currents, country of origin of fibers, buoyancy of fibers, world events at the time. Whether or not a certain king at the time was left or right handed, etc....
Ok, of course I'm exaggerating. BUT YOU GET THE POINT, don't you ? Thus can you see the hesitation for anyone to ever try to prove a negative, like in this case ?