I hadn't even thought about how the Responsibility messes with inheritance. *amused*

This is what I mean by finding her feet with world-building. TotF -- and StEKR, for that matter -- are both trying very hard to world-build without As You Know-ing or similar, and they succeed a majority of the time. But you get the sense that the world has been built in approximately the same way the exposition is delivered: in patches.

Or it could just be DD's usual casual relationship with continuity reliant on Rule of Cool. (Oh, TV Tropes. What would I do without you?)