* In the "Obsidian Age" storyline, the JLA were missing for long enough that Batman's protocols for a back-up League of his choosing kicked in. Nightwing was the one chosen as the field leader, with Batman describing his former ward as "the best" & "the only one I could choose to lead you."
** When the new JLA were supposed to be having their first meeting, and promptly started bickering among themselves, Nightwing walked into the room & shut everyone up by telling the rest of the team that if they want to fight, they will ''not'' do it in the JLA's conference room. Even more impressive, is that both Hawkgirl & Green Arrow note that the first words Dick spoke sounded eerily like ''Batman''.
* Towards the end of the "Battle for the Cowl" storyline, Dick sets out to put an end to the chaos himself in the strongest way he can think of despite his reluctance previously. By taking on his lost mentor's name and cowl, becoming the new Batman.