Well they were all pretty much caught up in the moment of seeing their families for the first time a long time, but yeah they all could of noticed there was nobody there to greet Kate and bring her over so she'd feel not left out. But they also know that she was in custody of a U.S. marshall when she was on the plane and they didn't want to bring attention to how close they've been together and what really had gone down about how the plane crashed.