Ok wild theory time. What if we get Unei and Doga in 6.4? Course they would need to have souls in order for this to work. Yet they both died over in the 13th. They even say something like even if our bodies die our souls will live on before we leave them to deal with Cloud of Darkness. Now I don't think that we will or how it would happen. I still don't get why there's ninjas in the WoD raid besides that they were common enemies in III's version. Lore wise there's no explanation.