Exodus is not open, it has a x by it meaning no new characters can be created there. I clicked on the link you provided and got the following list:

- North American/European data center
　○ Adamantoise
　× Balmung
　× Behemoth
　○ Brynhildr
　× Cactuar
　○ Cerberus
　○ Coeurl
　× Diabolos
　× Excalibur
　× Exodus
　○ Faerie
　○ Famfrit
　× Gilgamesh
　○ Goblin
　× Hyperion
　○ Jenova
　○ Lamia
　× Leviathan
　○ Lich
　○ Malboro
　○ Mateus
　○ Midgardsormr
　× Moogle
　× Odin
　○ Phoenix
　× Ragnarok
　× Sargatanas
　× Shiva
　○ Siren
　× Ultros
　○ Zalera
　○ Zodiark