ok gonna try to answer two of your questions.

1. why pally lead? because pallies are awesome at holding aggro and not dying. why warlock follow? because the warlock can dot up everything the pally has picked up and never pull aggro. this will not give you trails of bodies. this will give you piles of bodies at various intervals. healing is quickly done in between pulls. you might have issues with casters, but i find it best to make the caster your last target. pull all the melee mobs to the caster and then consecrate, ret aura, judge, auto attack. every mob should get a corruption and a curse or siphon life and you're done. pulls should be at least with four mobs unless you have no choice. no less or you're wasting your time.

2. as far as having two locks with two fears, there's several ways to do this, all of which have been discuss in these forums. i know, its kinda hard to search that. but just letting ya know!
here goes macros:
lock1: /castsequence fear,
lock2: /castsequence , fear

or...
lock1: /cast [nomod] fear
lock2; /cast [mod] fear

i prefer the modifiers over the castsequence. include target parameters to fit your targeting method.