I look at Sub and I immediately see Scarecrow; You get lamed out but once you're in, you SHOULD get good plus frames off MB db1, and mixup with cmd throw and strings. Those are my first thoughts. Hell, have the clone out with the cmd grab being a MID would make it fair that the clone isn't loopable since you have an unblockable combo starter. Even then, your opponent has air mobility, pushblock, MB B3, etc. That said I understand why command throw as a mid isn't thing as it would be very strong.
As it stands, I'm wondering.. What is the advantage of keeping the opponent cornered?