[quote=Metronome]
Let's face it, Batman would totally know. He probably would have figured it the moment Bucky surfaced as the Winter Soldier. That means Nightwing could either have learned it from Bats, or he could just suspect it.If you wanted to somehow figure out a way for him and James to have known each other in their Bucky and Robin days, then James would probably have told him himself. But that would make Nightwing obscenely old.
[/quote]

I can buy that, Batman I can't imagine would be super trusting of Bucky considering his alliance with Captain America and thus having a connection with The Avengers (Howard as well). Dick would want Bucky on the team as the trainer though because of how skilled Bucky is. I'm sure Batman warned Nightwing, but Nightwing hasn't really talked about it with Bucky yet having not had the chance.

Also with Howard I can't see him realizing yet that Dick is Nightwing until this starts, since Dick's going to be honest about his identity to the others seeing it as a show of trust.