If nothing has changed, I wonder if this still works:
So with Terry's D crackshoot, if the opponent blocks the attack standing, it puts you at -2 frames. If they block crouching, Terry is put at advantage of 1 or 2 frames. The fastest move you could do is a standing C. You can cancel the animation right as he adjusts his hat.
Now, the funny thing I noticed is that if you hit someone who is crouching with D crackshoot, you get a free combo. Again, right when you adjust your hat, you can do st.D or st.C and it'll combo. The timing is tight, but it's interesting because a special move leading into a situation combo is fairly new to me. My interests lie in when will you hit someone with D crackshoot while they are crouching and not blocking? I don't know if sweeps will hit crackshoot, but for a special move to be a combo starter is very interesting.