Let's go ahead and call Groh's dual blade stance DB. From what I can tell he has A, B, and K as options from this stance. DB A is the low hitting tornado spin, DB B is a mid-vertical that can be cut short to go back into DB, and DB K is a low sweep kick that leaves you in DB.
From what I've seen moves that cancel into DB don't appear to leave you at advantage on hit or block once you've entered the stance, then again a lot of these players don't seem to do a DB attack as early as possible, like in the first gif you can barely see him enter the stance but in the second he just kinda stands there for a few frames before doing the kick. These multi-hitting attacks like DB A and B might do really good chip damage in SC.
Also, am I the only one underwhelmed by SC? I know the gameplay we've seen so far is lemming quality, but the fact that you can't combo into it makes it seem like a waste of meter just to get some chip damage and like 3 new moves.
edit: there's also that mid horizontal that leads to a throw-like animation.