Re: The Joker sized elephant in the room
If Ledger were still alive, I could see Joker serving as the judge, just because he targeted Dent in TDK and because one of his stories about his past involved his wife getting involved with the mob. The scene could've elaborated more on Joker's past through the sentences he passed on the upperclass rich--businessmen and elected officials who were tied with the mob--and progressed Bane's plan for Gotham.
"I am for no master nor moral persuasion. I am for myself. What your yearning soul, madam, might mistake for loyalty to person or Purpose is merely a firm and, aye, principled determination to accept responsibility only for myself and my own actions." - Elric of Melnibone, The Revenge of the Rose (Elric: Swords and Roses).