Karinna,
The fibers are consistent with Coroner Meyer's opinion that JonBenet was wiped down. That she was also Digitally Penetrated and underwent Sexual Contact.
So it looks like there was a sexual assault and a head blow Upstairs followed by staging down in the Basement in the manner of inserting a paintbrush or finger that had already touched the broken paintbrush, thereby transferring the splinter, then wiping JonBenet clean and redressing her in the size-12's?
So you can go for no sexual assault, and staged sexual assault, or both. If its just the latter then why do the R's first fake a sexual assault then clean it all up and hide it away beneath a layer of clothing?
If there has just been an accidental death via anger or mishap why all the sexual stuff and ligature asphyxiation, where is the percentage in that, does it not turn an accident into a nightmare?
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I am not sure where the head trauma to JBR happened, but i don't necessarily think it had to be upstairs. What's to say definitely where it occurred? It could well have happened in or near the basement couldn't it?
There was also no proof to my knowledge of a sexual assault on JB on the night she died. I believe it was made to look as if a sexually deviant intruder broke in and did those horrible things to JB to set the stage as to motive of why she died, and to take the onus off any of the Ramsey's having any involvement, because the old cliche that nice wealthy people in beautiful homes don't do things like that to their child. Keeping up appearances i imagine.
As to your question about the R's faking a sexual assault and then cleaning it up, that could be for a reason or reasons only known to whoever did that. Why do perps. do what they do when they kill? I guess we would have to be in their head to know, and thankfully most of us could never imagine what goes through their head, and who would want to? We try and rationalize such things because it is human nature to try and make sense of things even when they don't make sense.