Well that is interesting, But I think unless they are able to pool hundreds of people to publicly generate the parameters in a trustless manner I kind of doubt the darknetmarket people will use zerocash over zerocoin. I'm willing to bet money they would trust meeh over matt green et al.
They seem to think that they can, but the answer to that question is not clear as it is based off of random Twitter messages. We could really use some clarification on this by the original ZeroCoin/cash developers.