I find it strange that he would do this... Wouldn't he add a signature?
I don't think it is that strange. He has done it in the past when people thought he was Dorian Nakamoto. There is no need for him to prove his identity, people already know that Craig isn't satoshi.
Gives a good reason for the media to pump the bitcoin though leave them to it i say. When the public read they are wondering what the big deal is about bitcoin even more.