Even though his spawn groups are popping, we've cleared the first floor of Ssra about 10 times now without a single spawn. We can't possibly be THAT unlucky. Perhaps this is the same bug as the others we've been having lately where mobs sorta spawn, but don't spawn in game?
Commander Zherosh was fine and all the other named have been popping, but this guy has like 30 spawn points with 12-20% spawn chances ...