Well i have an illo that eludes to that possibility, If you ever get you hands on the Streetfighter II Animated Movie artbook that covers all the preproduction work(and posters)of the anime film, There is a drawing of the Shadowlaw HQ above and below ground, Bison has a shuttlecar that takes him to Thailand where he comes up through a phonebooth wearing civvies(like the old Batman 66' show, changing clothes as he rises)to appear next to a grocery shop he owns, here we see him talking with customers who have NO earthly idea who he REALLY is! No doubt this allows him to mix with the folks, find out whats happening on the street! I find that most curious about him, how.....human. (I think even Chun-Li would be surprised!