Nini, Bang doesn't have a flutter jab. You have two. Most characters with a flutter jab have a standing jab that whiffs crouching and a crouching jab that is more universally usable.
CT Bang had the worst of both worlds in some matchups, a non-flutter jab that whiffed crouching. Then you add on universally bad normals, and he was real bad. CS Bang, they only really fucked up on the damage and risk reward. Otherwise, he's fine, which is why CS2 Bang is pretty much identical in most ways except for damage and seals and a couple changes to frames, some moves slower, some moves recovering much faster on whiff (Oh, and his combos look way better)