Also, "if I wanted to know who you were, I could have discovered it ten years ago...for all you know, maybe I did."
By this I assume that Batman:Year One is still in continuity and that Gordon has always known since then? Because "blind without his glasses", my ass.
Of course, that makes the AzBat storyline pretty iffy, since in that case, Gordon should've made the connection earlier that this wasn't Bruce!Bat flying around.