Exactly - averaging. I can't much argue that having the bonuses 100% of the time is better than a weapon that averages higher over time (obviously - look at the focus on ACC and DoT in this game) However, if you're not in the position to mess with averages (you're busting 1-2 WS's to regen MP, etc) chances are that you won't crit (given the % on the weapon) which would raise the effectiveness of K. Pole. Put in other terms:
A 1000 dmg WS 5 times, or a 900 dmg WS 6 times... If you were partying or doing anything else for an extended period of time, use the 900 dmg one. If you were to pull a one shot wonder, use the 1000. Kinda a skewed example, but I was never really arguing that DoT wasn't best in the first place, simply showing that Kirin's Pole is in fact just as good.
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