I don’t think I followed any stories involving Hush since before the New 52, or maybe I did and I don’t remember, but the last time I’ve heard of him he was still wearing Bruce Wayne’s face while the latter was “dead” after the events of Final Crisis.
Batgirl could call him out as a fake Dick Grayson easily enough just by looking at his butt.
From – Batman: Prelude To The Wedding – Nightwing vs. Hush
