Found this link in another thread; Deej explaining that Xur is not RNG.
[b]Deej: "it's not random, there is a plan. But every time I ask the guys who know what Xur is selling.. *paraphrased: they ask is it with your community manager head on or your warlock head on*?"[/b]
Apologies to the OP of this link, I've lost your thread and I don't know your name. Just don't want this link & your thread to get lost in the masses of Destiny topics. Shout up if you see this and I'll link your thread in.
Edit: Link to OP of this finding:
https://www.bungie.net/en/Forum/Post/76535585/0/0/0/0
Edit 2: Just to clarify as some think is a stupid revelation; I've always believed Xur was RNG but this is evidence of such.
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Obviously Xûr isn't RNG. What was your guys first clue.