Al'akir needs his motivations for aiding Deathwing explained better, fair point. In fact I'm not really sure why Neptulon and Therazane are on our side while Al'akir isn't, you'd think an Earth Aspect would get on much better with the Stone Mother than with an air elemental lord. There's certainly a motivation for killing him though given that he's started a war with the Ramkahen, guardians of all the Titan artifacts in Uldum, including burying one of their cities with a sandstorm.
The Bastion of Twilight is part of a seperate building called the Twilight Citadel. As far as I know its not connected to Grim Batol, which they have also taken over. It is also not their finest looking instance to date, though certainly not their worst either.