Well what they're looking for really boils down to a passive leaderboard section, since having a leaderboard with a very high barrier to entry allows for the 'long haul' of PKing. But this doesn't mean that people who were on that leaderboard, or people who were aiming for a position on it, weren't 'mob pking' or anything. If the 'all time' board came back its the people who are PKing in mobs who are going to get positioned there first, since they're the ones getting the most kills.