Some guilds may want to AOE block on incoming if they are just starting with this mob as the initial Frenzied Slice hits for max damage due to debuffs not being present and can crit very high if your raid is not quite fully geared yet.
Pulling Kultak straight back against the wall behind him will give plenty of room for the OT to grab the adds for the inital burn down. Make sure your dirges and shaman debuff Kultak asap once the adds are under control.