FFXIV should take a note from SUIKODEN

[Risvertasashi]

So if anyone can talk Yugi into moving in his caste, nobody else can have her? And everyone who have to talk to her for a quest have to go to the castle of that one player? ^^

I don't think you understand. It's one version in your personal timeline. MMOs do this, as it wouldn't be very fun if only one person could do the main scenario quest (for example).