Re: Stuff you like to believe happened in Nolan's series
JGL would have made a perfect Dick Grayson and part of me wishes the reveal at the end would have been that, oh your birth name is Dick Grayson not John Blake which would have been believable since he could have been adopted and moved around through orphanages a lot.
But the reason I don't think of him as Nightwing is that these movies are only concerned with Batman and Batman as an everlasting symbol. If Blake were to adopt an new identity other than Batman, even if it's "new Batman" it seems that symbol is lost. Is Nightwing gonna show up when the Bat signal goes off? Why? Why not have a new symbol like his chalk symbol? This leads me to think he is mean to become a new Batman, making Batman a symbol and more than one flesh and blood man.