Eh, could work. I still would prefer NPH.

This casting choice is much better imo, especially if hes gonna appear in BvS or in a Batman movie with Batfleck. Ian is a perfect choice for an experienced Dick Grayson

Eh...Maybe it could work, but I just don't see it.

Nah, I'm still holding onto my dream casting of Jared Leto as Dick Grayson(even though the window is closing really, really fast because unless he drinks and bathes in the blood of teenage boys, he can't look young forever).

I think all 3 of the actors mentioned above could work. They each have the look down in my opinion, and I think they're decent actors. I'd have no complaint one way or the other.

I think Jake would be better as Hal Jordan but that's my opinion. Ian would be perfect though.

You do realize Leto's older than Affleck, right?

Gyllenhaal has the obvious acting chops but I prefer Ian Somerhalder. He looks just like Nightwing and is a decent enough actor.