Absolutly right, i was mearly using blu as an example as to why sch aoe'ing w/ kaustra shouldn't be considered in this debate.
Since we're talking about blu, blu has one of the highest zerg potentials vs. mobs without super high defense. The 2 hr is still limited to 30seconds but the 5-6 spells you can fire + skillchain bonus add up quickly. After this wear they can maintain decent and consistant damage w/ almace and aftermath. However, the 2hr trick relies on the blu SCing, and therefore becomes less damaging in a zerg, since the SC progression will be messed up by other WSs. So i wouldn't put blu up in a party zerg situation, but as a DoT or a solo zerg, it seems pretty top notch.