Also, there's still something I don't understand. (if anyone has a theory, I'd like to hear)
Why the hell did BK chose to duel in the very first game? I don't believe he seriously thought the banker would target him, since Tobita was higher on the stairs. He definitely knew it was a bad move, but did it anyway, probably to start a mind game of some sort.
As long as I don't understand this, I will not take for granted Baku making the obvious choice. Even with 200 bios at stake.