This is cool I would post what percent of all people are certain subclasses. It's easier to see if massive numbers could lead to certain supers having more kills. The voidwalkers make up 12.7% of the players. The nova bomb makes up as many kills (in percent) as the population of voidwalkers. That means it's a balanced super. It would be easier to compare the percent of kills to percent of the population being that subclass.