That was what it was supposed to be. A meeting for an alliance between your group and the Phantom Troupe as Chrollo thought it was valuable. But, you'd have to see how it went first. After all, he was the leader of the Phantom Troupe.

You were the leader of a group of criminals—the equivalent to the Phantom Troupe if not stronger and better. It was filled with people with lethal abilities, resources, and intellect. That's why Chrollo wanted the alliance.

He arrived at your base with all the other Troupe members as you really didn't care how many people he brought along. Plus, he couldn't trust you guys that easily.