Ah, I should have realized that. I'm still not sold on that combo. I haven't really implemented it in my game yet. I think it would be hard to hit confirm that for the simple reason there is so much time before 2D hits. It can look like it's going to hit em crouched but they have so much time to stand. I'm pretty sure I've even seen some players on GameChariot mess this up on the last update. If they IB it at the last second and you're already inputting 6A, you're screwed. That's why I like 2D, 28D with meter. If it hits, RC air dash, combo. If it doesn't RC, air dash, JB crossup, continue pressure.
The 2D, 28D, RC, air dash combo also does a little over a grand more then 2D, 6A etc. I can see how it can be useful without meter though.