I think he is probably refering to the balance talent 'Earth and Moon' which increases spell damage taken by 13% on the mob. Also 3% extra hit from improved faerie fire. I run the 4 shammy 1 pala configuration myself and I will definately be experimenting with a balance druid in the mix at 70. Luckily I already have a 70 druid waiting for the rest to catch up (They are at 58 ). It will be handy having the 5% crit aura be up all the time, also it saves a couple of points in the elemental tree (Not that u can get much with them). Lastly it will be good to make use of druid items that drop.

Im not sure if I can maximise the druids dps at the same time as playing the shamans but thats the reason I need to test. Luckily I am a button masher anyway so I shouldnt miss spellcasts too often