Originally Posted by Shelendil

For your first kill you'll almost certainly need to swap, but Brutallus will only get easier with gear. Especially since many of the belts, boots, and bracers in Hyjal and BT were poorly itemized compared to the Tier 6 counterparts that drop early and often in Sunwell.

More specifically: a raid set up for Brutallus will likely kill Kalecgos, but there are many raid setups that can kill Kalecgos and not Brutallus.