Not to be crass, but yes, the healer assigned to a task is certainly most likely to be the top healer for that task. Let's not act like shamans couldn't keep a tank up. Reckless spam has tremendous throughput. And to be clear, I'm not advocating shaman nerfs. Rather, I think the days of "clerics should be totally one dimensional because they're the best healer" should be gone. Clerics need more diversity.