b) more importantly battle hymn. Battle hymn will heal you for each hit you do after killing one, so aoe'ing means you can heal to full just from attacking.
Using these 2 doesn't mean you have to be a shadow priest or tank. Noone else can stack up iron mantid reasonably.
c) These packs do not respawn fast enough by themselves to farm, you will need to kill other things or stand on the spine while waiting for respawns.
d) Noone will ever need windwool cloth in 5.X
B, I didn't say that.
C, Actually they do, since there are 2 points if u had taken a look to the link :P
d, you'll never know when u need windwool cloth, i assume you will need it down the road in these patches.