After one of the groups watching the outskirts of Dry City kidnapped the Brown family's investigators, Minos asked the Miller family to keep an eye on House Silva's actions.
Because those noble families had a long history of spying on each other, it didn't take long for Abby's family to inform Minos of the changes in House Silva.
Because of this, Minos already knew that the leaders of the Silva family had not yet tried to communicate with the royal family. On the contrary, his enemies were making various investigations and preparations for the future.
With this in mind, this young man had an idea of what the leaders of House Silva were planning and, consequently, what would be the best time for him to act.