@liuliuliuman
The nobles expected Stant to be made Archduke by the Emperor, because that's what everyone was expecting; Del threw a wrench in this by becoming Archduke instead (just for Rinrin's sake lol).
However, said nobles looked down on Stant, essentially considering him a small-time country noble, and were planning on supporting the surviving Prince from the former royal family (the majority of whom Del offed). So they were basically planning rebellion.