Satoshi probably wasn't Japanese. If you're trying to remain anonymous then you probably wouldn't choose popular names from your alleged native country. You'd probably choose one from somewhere else. Or maybe it's a double bluff... Yes, theymos is satoshi.
That makes sense, maybe Satoshi Nakamoto aka Theymos (sorry Sir) is a big fan of Japanese people (country) so he intended to use that pseudonym in purpose to trick us and remain unknown.
My guess is that he's busy reading manga and watching anime while living in Mt. Fuji