Whistler also used 236C in one of those matches, the difference is he got blown up by Dora.
Anyways, it looks like when you do an RC 6A combo near the corner you're supposed to actually do j.B instead of j.2B so you can get enough height for 4D~A. Works on most characters, except for Rachel, Litchi, Hazama, Valk, Jin. Yay for match videos.