Although we are going to be fighting to reinstate Thrall as the Warchief of the Horde (no telling what's going to happen to the whole Earthwarder thing), Garrosh is in essence a MORTAL threat. It can be imagined that your raid is the actual size of the strike team to take him out. You aren't relying on outside assistance to empower or assist you for it (Illidan, Yogg-Saron, Arthas). You aren't fighting an invincible foe as it HAPPENS to be on low-power for whatever reason (C'Thun, Kil'Jaeden). You aren't there to help someone ELSE do the killing (Dragon Soul). You are actually coming against a matched threat, however dangerous to the world he happens to be.
I didn't find the right solution from the Internet.
http://www.mmo-champion.com/threads/109 ... rosh-s-End