I usually don't believe anything about a game's plot that a friend of mine says ever unless I see it my self since they have been wrong before. However me and my friends have different interests when it comes to games and are respectfully about each other when it comes to spoilers so we usually never have this kind of problem.
Although learning nearly everything about FFX (largely due to my friend and my uncle both playing the game when I visited them each a few times) has prevented me from ever buying it. Not that it really bugs me that much.
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