The original confirmation post from Bungie (link below) has been updated - it looks like the development team might be investigating, thanks to BNGHelp3. So in other words, it might be too soon to say definitively that it can drop from the Blade of Crota in the Fist of Crota mission. Might want to postpone farming until we hear back from Bungie/BNGHelp3.
[url]https://www.bungie.net/en/Forum/Post/138057765/0/0[/url]
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FINALLY! We did it people. Finally, Bungie are actually aware of this issue, and something is being done about it. Stay tuned to the Forums! I'll carry on farming. If I get it, I'll post up on here. And yes, there will be an immediate video recorded of it.