it never made sense for batman not able to find out the joker true identity and his failure casts doubts on him being the world's greatest detective so now we have immortal joker and the joker triplets great retcon. it would have made more sense for joker not being the Red hood but letting people assume so rather than the current silly retcon. I mean would a joker let others cut in on his action ? it's a totally absurd scenario which tries to introduce alien elements in the jokers story.