Not sure if I remember this one right, but it went something like:
6D, j.C, 2C, j.C, j.2C airdash, j.C, j.2C (please correct me if i'm wrong)
I'm probably wrong though. it's been a long while since I saw the combo. Also, off of his 5D/2D, you can land a 2C into an air combo.
Another 6D combo (that i've only done in theory, but there's no reason it shouldn't work other than the whiff part) i've figured out is:
6D, dash in, 5C, 236A, 623A whiff, 5C, 236A, 6C.
If someone could try this one out and tell me if it works, it'd be much appreciated. Be aware that the 5C will NOT pick up V-13 or noel. It might not pick up carl either.