Xur did not sell the gjallarhorn this week. Maybe players, including twitch streamers were online at the time of reset and were at Xur as soon as he appeared and he never had a weapon. The rumours and photos are 100% fake
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You think bungie can't remove it before it comes out. Xur is random however bungie can and will alter him as they deem fit. Xur was going to sell Gjallahorn and bungie decided to remove it! This has been proven that Xur can be altered when he was allowed to stay for an extended time around Christmas I believe.