You'll notice that, unsurprisingly, he has no experience or education in mathematics and cryptography, the two things you need for a cryptocurrency.
Note though, that he is not creating new cryptography, he is using well established, true and tested existing cryptography.
Mathematicians and cryptographers have often produced new crypto that has later been proven faulty.
I think both Cloakcoin and Darkcoin are irrelevant, in a year or two they'll be nothing more than a bootnote on a Wikipedia article on failed cryptocurrencies.
Offtopic. Create a new thread for your predictions.