Zachary was listening to the information provided by the Fruit Brother while observing the people mentioned in the shared intelligence.
During this time, many newcomers appeared outside the manor gate. Zachary noticed that besides Rufus, who would initiate communication with newcomers, the Fruit Brother's few brothers, like the Fruit Brother himself, would actively approach those newcomers who were reluctant to join Rufus's group.
The situation was akin to a screening mechanism, with Rufus first contacting the newcomers; if the newcomers didn't trust Rufus, then the other members of the Fruit Brother's team would continue the outreach.
Of course, there were also some Lone Wolves, who neither joined Rufus's team nor accepted the invitations from the Fruit Brother's group and didn't interact with others, opting instead to find a quiet corner to stay in.