Well after initiating an old tactic of going into an instance super buffed by pots and classes, we managed to drop the Black Morass. It looks to be luck with that last boss though. He didn't time stop us right off the bat like he did before so we managed to drop him without much in the way of problems. Unfortunately we noticed that it automatically completes our key quest for Kara so we can't just port others in to turn in their quests for it.
We will have to run this instance again for those that will need this last step. I know there is Wildturkeys who needs this last part. I think Elade, Cher, and Edamus have started working on their key quests as well. If we can get them all caught up, we might be able to get them covered on the next few BM runs we do.