Yamamoto has a thing for burning up three people in one go, no?
Juha Bach has a sword? Perhaps a zanpakutou?
OH MAN BANKAI THIS WILL BE GOOD. I think he maybe might try and just burn everything before he can steal it? Or perhaps he's banking on the thought that his reiatsu is so massive and his flames so powerful that trying to steal it would be too difficult/impossible? Maybe his bankai is like Ichigo's stoic phase where he "converted reiatsu into pure strength" or something.