The Second Bureau led by Major Durra is not dispensable for Shire.
Although the "Lady in White" is secretive and has a vast army, their weakness is that the vast majority of members come from the civilian sector, particularly the middle and lower classes.
It's extremely difficult for them to obtain secrets of the government, officials, or the upper echelons.
But for the "Second Bureau," this is quite easy.
Thus, the two can complement each other: one in the open and one in the dark, one in high places and one among the people.
On the other hand, Shire does this to sideline Clemenceau.
One day Clemenceau becomes Prime Minister, he would be the direct superior of the "Second Bureau."
If the "Second Bureau" is under his control, he would have chips to bargain or even confront Shire.
But if the "Second Bureau" accepts Shire's command, Clemenceau loses his last dependence and can only look up to Sherma.
