Not sure what they are going to do with the ninjas in the system since Germany has Guren in events rather than here.

And that's why commented how are they going to release the feature without ninjas. With Guren being introduced in events in Germany, I don't know if they still plan to add it in the feature or not. In China, it is vital to the feature since you get certain amount of fragments that will be marked unknown beginning in the month before they announce who the new ninja is later in the month. Hopefully, it's just to milk people in events before having them when they use the feature.