What if Daybreak Town was broken up into pieces at the end of the Keyblade War. Radiant Garden, Twilight Town, the Keyblade Graveyard and the Land of Departure could be the pieces of Daybreak Town after the world was destroyed.
Radient Garden and Twilight Town have similar house designs that could have originated from the house designs of Daybreak Town. Twilight Town also has that unicorn themed mansion, which could have belonged to Ira (not all the foretellers stayed in the castle since in the last KH chi update it was revealed that Gula stays in abandoned warehouses and doesn't go to the castle often (everglow on YouTube has the translation where chirathi, outside of a cutscene, says this).
The Keyblade Graveyard is a wasteland filled with keyblades from keyblade wielders from the KH chi era.
The Terra's Mark symbol that is worn by students from the Land of Departure looks similar to that of the heart shaped symbols on the foreteller's keyblades and the table they use in the castle for their meetings (the table can be seen in the pre-E3 KH 2.8 trailer).
Radient Garden and Twilight Town have similar house designs that could have originated from the house designs of Daybreak Town. Twilight Town also has that unicorn themed mansion, which could have belonged to Ira (not all the foretellers stayed in the castle since in the last KH chi update it was revealed that Gula stays in abandoned warehouses and doesn't go to the castle often (everglow on YouTube has the translation where chirathi, outside of a cutscene, says this).
The Keyblade Graveyard is a wasteland filled with keyblades from keyblade wielders from the KH chi era.
The Terra's Mark symbol that is worn by students from the Land of Departure looks similar to that of the heart shaped symbols on the foreteller's keyblades and the table they use in the castle for their meetings (the table can be seen in the pre-E3 KH 2.8 trailer).