Nazgrel is spawned in the wrong spot. He should be on the other side of the room.
Video proof - https://youtu.be/YcEqpVfrE7U?t=55m31s
Also, the quest The Admiral's Orders part 2 (id 831) should be turned in to him in vanilla, not to Vol'Jin. This can be seen in the video. The objective and details text for the quest should also be updated to say Nazgrel where it says Vol'jin. You can see the text here - https://youtu.be/YcEqpVfrE7U?t=10m21s Pause the video to read because he turns it in fast. He also has the gossip npcflag (1) in the database, but in the video it goes straight to the quest when he talks to him, so he must not have the gossip flag.