I mean, what the heck?
How are we suppose to know? It’d be cool to see him but he’s not on my top list of must have
He’s not really a Batman villain in most respects. Probably only in a cameo at best if other non-Batman villains (like Deathstroke) were to factor into the story.
He did make it to Gotham and Legends of the Super Heroes…
His appearance in Gotham TV show was awesome!
The Gotham Grundy was awesome, it even included an origin story for him. One of my favorite episodes.