Personally I think xur should have a loot table of exotics exclusive to him. That way, things like gjallarhorn stay rng based, and there's more gear to collect, and there's almost always something to buy from xur.
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Sounds perfect. But they would have to keep creating new ones so the specifics one for him don't roll over too many times.
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Yeah, there would have to a rather large amount of exotics to sustain the system.
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Which sounds even better.