All Might is the symbol of peace and a very strong character in general. That being said, he isn’t even in Bass’ weight class. Bass could take down All Might with a single punch. Bass has gone toe to toe with Megaman and even surpasses that navi’s strength. Bass has limitless speed as well and this makes him an impossible foe to deal with. There just isn’t really anything that All Might can do to try and stop him. Bass is simply on a completely different level. Bass wins.