There's should be other agents of the nine that spawn on the other planets that sell legendaries and exotics sometimes so it doesn't replace Xur but can still do the armor upgrades from the last time Xur was at the tower say yes or no if you agree
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Yes xúr is a -blam!-
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Basically xür is the only cis-Jovian in this existence and was created by the nothingness of a result of Kabr's destruction to form the aegis. Knowing that "the nine" are actually the nine planets in our current solar system (also resembled in the speakers emblem "blessing of worlds) can be traced back to this theory. So to answer your question, No, he shouldn't have other agents with his sorry ass that keeps selling stupid shit no one wants.
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Indeed a smart question one who sells heavy,primary,secondary,and armor an amazing question actually I'm happy now