Yeah, we certainly don't want any witch hunts here based on conjecture. But I've said it before, and this is illustrated by Teddy's example of the Burton sculpt--no sculpt is safe from recasting by indivviduals with no respect for the hobby or artists involved in it. Best to just assume a sculpt will be recast whenever it is made available in any capacity.
It's a very sad state of affairs but I think you've pretty much hit the nail on the head with this statement
Because the KR sculpt was in such a limited quantity we know it's likely to be one person of about 5. What's really disturbing is that would imply it's somebody Trev trusts.
No idea if this particular individual is responsible for all or any of the other sculpts but Q's possession of the KR sculpt is very very damning.
But as I said no evidence to speak of certainly not of any nature other than circumstantial so very little can be done at this point.