You are quite right on the different talent for different strat part.. But my post was a bit ignorant to the fact that people do different tactics and while it makes no sense to me, it might for them. So sorry for that
So ye for Will I've done it on both 10 and 25 and they arent too different.. Like in your case you get the shitty job of cc as an arcane mage which is pretty funny on its own(I guess you have no hunters?), And as for courage, If your non-boss tanks do it right, courage will go through the raid to the strenght spawn platform, meaning slowing it down or dps'ing it will be on the back burner till it comes to the raid and then just quick switch from everyone and it dies real quick..
And as for Zor'lok hc refreshing stacks with AE is pretty much the only option,
I mean you could cast AM and cancel the cast to apply a charge, but thats a GCD that does no damage to the boss and you loose 1 AM stack, The other option is just to Barrage, but I found that the ramp up times and how often you had to do it was just too high for it to be really feasible.. But in reality.. nowdays it doesnt really matter even on Zor'lok what you do as long as you pull your weight in order to clear the enrage and keep yourself alive so the boss dies before the berserk..