It was also that activity by the Other and her agents (and Zola, though it's not clearly exactly which side she's on) increased drastically immediately following Klaus' disappearance. It is pretty clear that during the still unexplained final mission of the Heterodyne Boys they struck some kind of significant blow against the Other that mostly put all her active enterprises on hold - probably by eliminating all active instances of Lucrezia in this portion of the timeline. It is very significant that Lucrezia, when restored in Sturmhalten, doesn't know that Klaus returned, it represents a gap in her knowledge of thousands of years of history. It was only when Agatha becomes recognized as a potential vessel for Lucrezia, and then actually becomes such a vessel, that the Other's schemes reactivate.Originally Posted by Shining Wrath
As such, maintaining stability in the Empire for Gil would be significantly more difficult than it had been for Klaus simply due to the change in circumstances. Klaus was also presumably aided in building his empire in the first place by the absence of a Heterodyne from the scene, since we know they were a traditionally destabilizing element that even the Shining Coalition failed to completely overcome.