Given some of the names floating around for the part, O'Connell's casting just might come as a relief! lol
The kid ticks all the right boxes save one—he's too short. There are things that can be done to make him look taller on-screen, however. Most importantly, he's not a Rock or a Cara Delevingne. He's got real acting chops. Invader's right. With a proper haircut and a clean shave, he surprisingly looks a lot like the Bruce Wayne of the comics, albeit younger (especially when he dyes that ginger hair of his dark like he did for Unbroken). I know some have concerns about his physique, but I wouldn't be too worried about that. Despite being on the skinnier side, he's got a good frame, wide shoulders and bloody youth on his side! I have no doubt that he'd be able to bulk up in the time between casting and filming. That he also has a jawline fit for a cowl is merely an added bonus.