As the new head of the Brandt household, Erich-nii-san has the position of vassal of the vassal to Marquis Rückner. Luckily he has left a big impression on Marquis Rückner in this matter during this time.
Furthermore, Erich-nii-san is frighteningly clever.
Perhaps he will be appointed to a responsible and trusted post by Marquis Rückner in the future.