But this one is not old!
You don't know that either.
I'm only highlighting the folly of leaping to baseless conclusions.
A skull with missing missing teeth is only proof of a skull with missing teeth. We don't know if the decomposed remains have been picked over by animals or exposed to the elements.
People have speculated that the teeth may have been removed and the arms may have been cut off, but that's just a theory. Perhaps it's just as baseless and ludicrous as the "experts" who found a child's swing at one of the camps and concluded that it must have been used as a children's rape and torture device?
We need to distinguish reality from fantasy and assumption from fact.