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I dunno. The term Imperial seems to be used to refer to the Shogun and his personal staff. For example:
IDS 015190
Governor Tekagi is meeting with Chancellor Niemann under the protection of the Shogun’s own Imperial Guard, who accompanied him through the blockade and to the Rheinland capitol of New Berlin. The Governor was greeted with unusual warmth by the Rheinland Chancellor, who was himself surrounded by his own well-armed bodyguards. The two reportedly are going to meet privately to discuss the peace settlement and the safe release of the Kusari hostages. Today, all eyes are on Rheinland.
IDS 015218
The Kusari people are in mourning today for one of the few great men of our time: Governor Yoshinobu Tekagi. Upon hearing of his murder by armed assassins, Shogun Edo was enraged and shouted for vengeance. An Imperial taskforce has been called in to investigate what is left of the Governor's retreat.
IDS 393691
Rumors about The Order are starting to circulate again. I hear the Shogun has increased the resources devoted to investigating them and doubled the number of Imperial Guards around him and Governor Tekagi. The strange thing is, I haven’t heard of The Order operating anywhere near Kusari, let alone threatening the government. Still, they're probably right to be cautious now that things will be settling down again.
I'd suggest that this lends credence to my idea that DA was being lazy and just using the Shogun as a "Japanese sounding" word for Emperor. Given that the figure the Dragons' served under was explicitly named as a shogun, I'd say that also very strongly implies the post is inherited, so thank you for pointing that out.