Originally Posted by
Whoopzz
I'm at work posting on my Iphone, but to throw around some common sense reasoning...
FCFS is established by damage in relation to the ability cooldown. With 2pc T10, modeling the RNG portion as a flat 40% reduced cooldown, that takes DS to an equivalent cooldown (10 seconds - 40% = 6 seconds) with CS. Then you take into consideration the haste you have on gear or though other benefits such as heroism and speed pots, and you have a clear winner. More damage, less cooldown. If you don't keep it on cooldown, you're losing dps and defeating the purpose of even having T10.
As far as exorcism goes, I'd need some real numbers in front of me, which I don't have.