I've been thinking...
Something just doesn't add up with the Armory using Darkcoin. There is absolutely no way any legit darknet site would use Darksend while it is still closed source.
What am I missing?
You're missing an important thing. Darkcoin is, at a minimum, as anonymous as bitcoin. That's worst case scenario if we say darksend can be cracked. If not, it's more anonymous than bitcoin, probably way more, and only getting better. I think it's a great move from the owners.
What you're missing is anything that can inserted into closed source software such as backdoors. You have no idea what's in it because it's closed source. Thus, nobody truly interested in anonymity will ever run it.