Let me take this, and your point about Nightwing in Infinite Crisis a step further.
To me, as a long time Nightwing fan (he's my favorite DCU character) Infinite Crisis is how Nightwing should be written, that book gave you the template for a kick-ass reimagining of Dick Grayson. Essentially, Nightwing isn't "Batman-lite", that's what the golden age Dick Grayson was, that's not what Nightwing is. Kal-L acknowledged it, so much so that in IC #3 he openly stops and questions whether what they're doing is right, considering what a great guy Dick Grayson is. As Yoda pointed out, even Alexander Luthor called him a saint in a land of sinners. Nightwing should be the Captain America of the DCU, it's the one role that the DCU has never had before (mostly because Supes, Bats and WW are many things, but none of them are Cap).
You know that the slogan to marvel's upcoming summer crossover, civil war, is "whose side are you on?" I read a lot of marvel U stuff, and to me, that's the most pointless and ridiculous advertising slogan that the mind of man has ever conceived, and the next time I run into Jeph Loeb at con, I'll be sure to tell him that. Why? Because it's the marvel U, and if there are two sides to anything in that U, I know which side I'm on: I'm on whatever side Captain America is on. I don't need to know the issue. I don't need to know whose on what side. it could be everyone in the entire marvel U on one side, and cap, by himself, on the other side. Doesn't matter. I'm on whatever side Captain America is on. If I'm Peter Parker, the point at which I'm realizing something stinks is when Tony Stark asks me to join his side, but to "not tell cap about it." Dude. Not tell cap? In the marvel U, if you're on the other team from captain america, that means one of three things:
-you're either the bad guy
-you're going to lose
To me, that issue of TT, and in Infinite Crisis #5 and #6, that was Nightwing as the Captain America of the DCU, in that, I'm reading it thinking "yep, that's exactly what a great hero would do". He might not have powers, but he gets together what resources he's got, and they might lose, and they might die, but he goes headlong into it anyway, and he kicks Alexander Luthor in the face.
That's how I want to see Nightwing written. Someone once told me that Dick isn't the great detective Tim Drake is. That's true, I think Tim Drake is the logical heir to the mantle of Batman, if anyone is, Tim is the next world's greatest detective. I actually agreed with the decision, during knightfall, not to make Dick the new Batman, for two reasons:
Tim Drake is the "Batman-lite" of the DCU, Nightwing isn't the detective Tim is, so what's Dick Grayson? Dick Grayson is the Julius Ceasar and Alexander the Great of the DCU, in that he's the great battlefield commander. You look around the DCU, and Dick has all the qualifications:
he's lead two superhero teams (Teen titans, outsiders). There's no one in the DCU with more proven leadership skills.
no one has more experience than he does, he's been doing this since he was 8, and he's a grown man now, even in comic-time, that's a lot of years of adventuring.
everyone likes him. Batman knows what to do in any given situation, and he can give people instructions, but they don't like him, and they might not necessarily trust his motives. As Batman said in IC #4, Dick has kept all those bridges, everyone likes him. When Nightwing tells other people to do something, they can confidently follow their instructions.
The point of Infinite Crisis was to look at the flaws of Batman, Superman and WW, to show how, each in their own way, none of the DCU's "big three" was qualified for the mantle of leadership, because as much as they were the world's greatest heroes, they were unable to bound together in a time of crisis, and have people trust them. Infinite Crisis also showed us that Nightwing is the best leader in the DCU, he doesn't have the defects of character that the big 3 do. I can't see why this very promising story idea hasn't been developed OYL.
"Seriously, I am of the very firm opinion that if you want anything done right in the DCU, you turn to Nightwing"