Ehh. While the decision the princess made may be bad, I don’t really disagree with it either. And there was a compromise too. But I’m empathetic with how she feels
The manga has done a really poor job of using Sudou (him) till this point. They've basically told us he's one of the heads of the summoned organization, which is a group of people who want to subjugate the entire continent in revenge for summoning them. He shows up in the prologue of the first LN, we meet him before Ryoma