I thought that BUNJI made the loot drop system to where it choose items you didn't already have.? I had three exotics(skullfort, crest of alpha lupi, and hawk moon) then I picked up two exotic engrams and what do you know, I got crest and hawk moon.
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They did not make it so you 100% get a new exotic they just made it so you are more likely to get a exotic you don't already have