Who's to say Denathrius betrayed everyone before or after the machine of death broke?The venthyr have been shown in a questline (in the outside area of halls of atonement) they condemn souls to the maw even if they repented.They literally keep Garrosh there as an anima battery, so the venthyr corruption may have even started before the events of SoO.
Hope we can get him out of there, so we can bring him to Lillian so she could give the final end her truly deserves.
maybe he was sent to Bastion and they just noped him right on out of there
Finally someone who deserves the maw. Good to see
Wait, but the system was not broken at the Cata?His soul should be at Revendreth just like Garrosh...