IMO..to perform SCGs You have to press R-A instead of both at the same time.
dthrow, trot, R(interrupt trot)A, with short delay on the grab.
I dont know how to explain it, theres alot of confusion on SCGs,
but Youll be able to chaingrab sonic, pit, martha, or whoever was rumored to escape the CG with upB.
in qwertymans vid i noticed shieldcanceled grabs at 0:53-0:57.
Then he did shieldgrabs after that, which lead to him messing up.
reply edit: Interrupt the trot w/ shield, not full dash. After shield- immediately grab.
You will notice ddd slides a bit before and after the grab. Visible in the vid posted before, at the times i mentioned.
I cant really explain it differently, sorry. Its a confusing discussion since it hasnt been discussed much,
besides a handful of old ddd mains on the forum. Might just be the timing of grab during trot for all i know,
but this works against jab/upB escapes, contrary to popular belief.