I think people get the reaction to Uvogin's death a bit wrong sometimes. The Phantom Troupe isn't really a family; they're a pack of predators. The initial reaction from the other members isn't overwhelming grief, it's cold, sharp anger and a shift in operational posture. You see it most clearly in Nobunaga—he's not crying, he's fixated, his entire vibe changes to pure hunting mode. He wants Kurapika's head, not because he loved Uvo like a brother, but because someone dared to kill a member of their pack. It violates their code, their superiority.
Chrollo's reaction is the most fascinating, and honestly, kind of chilling. He gets that distant, analytical look. He's not mourning a friend; he's assessing a new, serious threat. The requiem he holds is less about grief and more about a statement of power and remembrance for the idea of the Troupe. It reinforces their identity. Machi and the others are pissed, sure, but they compartmentalize it almost instantly because Yorknew is still a job to them. The real emotional fallout isn't a big melodramatic scene—it's in the subtle, increased ruthlessness afterward, the way they become even more untouchable as a unit. Their reaction proves they're not sentimental villains; they're a force of nature that just had its territory challenged.