They were all some kind of killer or bad guy/girl. Strange coincidences for "candidates." Jack and Hurley are the only males who weren't; Sun and Claire as females. Yet in the long run- Charlie wasn't a killer- as far as we know; Ecko was a killer, though, and the Rodregis (sp?) gal. The other more minor characters, as I see, such as Boone, Shannon, etc. we don't know enough about them to really say. They may have had a temporary purpose for the island, too since they so easily died. Has anyone thought about the other planes survivors, who we have never really seen? What's their purpose? Or is this one of those questions that are not important enough to answer??