Its a sign from xür that he brought the thunderlord for the second time maybe he will bring you're precious ghallahorn next time.
Edit: Yes you guys are right he has never sold the thunderlord once plus also i think this forums is turning into a CoD community because if all this cursing calm down.
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Right, one random roll from Xur is a sign he will bring a particular random roll in the future. The only "sign" here is your gullibility and insistence on finding patterns where they don't exist.