I'm gonna disagree on a couple things:
1. if you use microdash 5B > 6A, it will never whiff on crouching. but honestly, even without it, I have never had it whiff.
2. the best confirm for AA 6A is sj.C/5B. you can get a full combo if you use the sj forward method, if I space the 6A and i think i will hit them at the absolute highest and farthest point of 6A's hitbox, I cancel into throw whiff, which on ch allows you to dash in after the throw whiff and use 5B > (5C >) sj.C etc, on normal hit your opponent can tech in the air though.