His recent tweets have made me question him as well, however he's had a large number of threats over the past 24 hours (for allegedly destroying an impending a buyout of Gox by leaking fraud, which if true would have cost Gox patrons money). I think he's just wrapped up in it, and maybe a bit scared.
Inviting somebody from Twitter to your physical address in order to assault them with a baseball bat doesn't seem "scared" to me.
I don't think internet bravado has ever been very intimidating to anyone.
Perhaps not, but it's indicative of the mindset of the person behind the pseudonym.
> I don't think internet bravado has ever been very intimidating to anyone.
Fbi has no trouble locking you up for internet bravado