The population is evenly distributed, to a point where simple questions such as [i]are hunters up[/i] and [i]are titans op[/i] can be answered by simple tables. If you want to dwell even deeper into the numbers and make it (maybe too?) complex, then feel free to do so.
Reality rarely demands complex explanations though.
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I'll say it again :) If the population distribution is based on the whole game (what classes people have) and the kills are based on PvP only, the correlation is not valid.