Having the specific area fully explored gives us an interesting ability to have all NPCs of that area marked on the map. If we unlock Thais subarea and check locations near the arena from Dream Courts Quest, we can notice something strange.
You can see the spot where Barzak should stand. He is not there. I checked some old recordings and found out that this NPC is missing since the implementation of this location. All other NPCs marked in this location are present in-game.
Is this a bug, mystery or some unknown part of the lore? I would really like to know, but the ultimate question is - where is he?