So Delves mean we have to have defeated all seven Naakuals?

Then why is it coming out in THIS update?  We don't even have the zones to face all seven Naakuals yet.

On top of that, it appears that one also must be able to complete Skirmishes as well.  I'll be more than happy to try Skirmishes when they decide to actually allow more than a .000002% drop rate on the pieces (so much so that they still run ~10M gil apiece on most servers.