Both of them (Ross and the hitman) can't be that stupid. Have you ever heard of a criminal, who accepts bank transfer for his services? This is ridiculous.
You do know that most criminals don't use bitcoin right? Seriously it is not hard for a criminal to send or receive a bank transfer anonymously, liberty reserve (which is what Ross used) used to let you do this before it was shutdown. There are lots of banking services out there that are available for criminals. How do you think scammers on localbitcons and such pull scams using bank transfers?
Normally all criminals use cash. Are there even anonymous bank accounts? Never heard of such services. If you're receiving bank transfers for illegal services you're asking to be caught.
The criminals used TOR and offered their services in the Internet, so they were accustomed with technology. Why not use one of the encrypted coin protocols available?