Catt being Catt, it could have been one of Heinrich's boyfriends, for all we know. :P Or an epithet going around camp. Just like Karl and Emil could be two random soldiers, we'll never know.

The problem with Catt is that you start having to be agnostic in the absence of external evidence.

But you're no longer compelled to have "carogne apostolique" in your headcanon, it's true!