We kill the first named in his room, then head to zone in. You can semi corner the mobs next to the door. Sometimes the ghost pop right after named pull, sometimes it takes a bit. Sometimes they auto aggro, sometimes not. I usually run up and grab the first set, kill the unmezzables and mez the rest. Balance the named till dead, kill the mezzed head up and kill whatever is sitting there.
Keep in mind that the ghosts path oddly, so when you head up for the chest, you could get more then one corner of ghosts.