This is nonsense. Bungie doesn't keep the Gjallarhorn from anyone. It may not be sold by Xur anymore but I honestly don't know how true that is. As far as it dropping it's all random. You're chances of having one drop are just as good as the next guy.
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I believe bungie took it off xurs list because it creates a " carrot on a stick" which keeps a lot of people playing and grinding for it , just my opinion though