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I highly doubt that.Because I'm 100% sure Nomura had no idea who Xion was when KHII FM+ was made.
Plus, Xion most likely has no relevance in Kingdom Hearts games other than 358/2 Days.
most likely because they never created a data of her. its like roxas, why didnt they create him a workable tomb? its most likely she didnt die the same way the others did, or she may still be alive.
i believed that the nobodies knew they were going to die, so tey created there own tomb LOL