The root cause of all this is that .cr2 file language has two ways of saying what is parented to what. The Parent (and inkyParent for IK-goals) lines in each prop or jointed part's long actor (and the on/off lines in the inkyChain sections), should have been enough. But instead they decided to "belt and braces" it and have the addChild tables also, and from that came all this complication.