That sudden remark was clearly not part of Oswald's script.
His plan had originally been perfect.
He had used a little lie to trick Batman into leaving, then chosen someone who could definitely keep Batman occupied and ensure he would not return at the most critical moment.
Then he would breach Gotham's final line of defense—the only good man in all of Gotham: Gordon.
A Gotham without Batman had merely lost the deathly specter shrieking through the night sky. A Gotham without Gordon had lost its last remaining conscience.
Oswald believed he could take on the role of Gotham's conscience.
Who said a conscience could not be black?
Besides, whether Gotham had a conscience or not, wasn't it always the same? People struggled through life and died in confusion.
Maybe replacing its conscience would bring a different kind of change.
As for whether Gotham's people agreed to such a replacement, Oswald did not think that was enough to count as a problem. It was not even worthy of being put on the table for discussion.
Look at the people Gordon had protected. Hadn't they come here with him?
They had even opened the doors of the Gotham Police Department themselves.
Everything had gone smoothly. Everything had proceeded perfectly.
Oswald could practically see himself controlling Gordon, controlling the Gotham Police Department, successfully becoming Gotham's mayor with Gordon's "support," and becoming someone respected, someone recognized.
No one would care about his height, because he could stand atop the platform built by the citizens.
No one would care about his strange voice, because every word he spoke would be treated as law.
No one would care about his limp, because he would always shine brilliantly, always appear at the conference table.
What a wonderful, splendid, meaningful day this was...
Yet it seemed this