It isn't confirmed but there's more evidence supporting it is xur than any other person/being/thing.
In fact, there is no evidence that it was anyone else but xur.
Therefore, it's xur.
English
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Flawed logic
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Edited by KygonMuffins: 8/31/2015 2:10:02 AMExplain to me how it's flawed logic? The characteristics and personality traits described in the grimoire card are that of only one character that we know of, xur. Tell me who else it matches? And what would their motive be to release him on the first place?