From my experience from playing with a Hakumen today...
Random BBS is a worse idea than usual. I'll see Hakumen air-dash, put in 632146D L3... And then get countered by a j.D from half a screen away. Even a black hole would have been a better result.
Makoto's 3C isn't particularly smart while Haku's on the ground, but if he tries to approach you from the air, if you time it right, her 3C will go under just about ANYTHING aerial that he tries to throw out, and then gets kicked down while landing. Her 3C seems to have a property where it avoids anything that doesn't hit low (and all aerials I'm thinking only hit high), so it's slightly more useful here.