That has been the pattern.
That is a logical extrapolation.
So it suggests that one way to catch the pedovores is to find how they are disposing of human remains after they have already stripped the corpses of everything they want. Standard Hotel had vats of muriatic acid. Other places have tunnels. Remote islands are suspected to have mass graves (bulldozer marks).
Would they dump remains at sea?
Place them in cargo containers on special ships with collaborating crews?
Think of all the ways this crime of mass murder could be detected by tracing the bodies back to where the killings took place.