I think it would be cool that if you have the Khostov and it gets an exotic upgrade. What better way to reward Day Ones with an exotic version of the first gun you get? It would be awesome if they called it "An Old Friend" and the flavor text said [i]"You got a friend in me."[/i]
I don't know what the perks would be, but still would be cool as heck.
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It actually was originally planned to be a weapon that could be upgraded to an exotic. Just an FYI