Got the Legendary Sparrow you can get by per-ordering the expansions, and I can't use the drives on it. Apparently rare Sparrows are better then legendarys... So that's stupid. *claps*
Edit: So I think there should be a way to upgrade legendary sparrows to an exotic status. You can upgrade rares, so why can't you upgrade legendarys?
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You use a legendary sparrow drive on a rare sparrow and it becomes legendary and upgraded. The more you know.