Disregarding all that "R.I.P."-stuff for a second, please allow me to say: The "Third Man" needs to survive and become a recurring character.
IMO, Batman has the greatest rogues' gallery in all of comics, but what he's lacking is an "evil twin". Spidey has Venom (well, he was the first one, anyway), Superman has Bizarro or Zod, Green Lantern has Sinistro, -- Batman has no one. I think that's a pity. I, for one, really love evil twins.
Hush would have been a good candidate, but he has been ruined by crappy writing. (Is he even alive OYL? Was that stupid Gotham Knights cliffhanger ever resolved?) Jason Todd would have been perfect, but he is apparently going to become a hero again (sigh).
In short: Give Batman his evil twin. It's about time. Let the Third Man live!