Yah, I believe the BB novelization said something to the lines of Ra's has been writing letters to his daughter or something like that.
So anyways, I had this weird epiphany of sorts when it comes to the Joker being in TDKR....and I thought of, in keeping with the 165 mins, and to use Joker properly, I would have to let go of Blake as well as the whole orphanage angle.
Much like how TDKRises takes nods from TDKReturns, Joker's arc will be very similar in that he's been quiet ever since there were no more official sightings of The Batman, not peeping one word to psychiatrists, doctors or even nurses(and Harley Quinn is not related to this story at all) but once Batman makes his return, there is some movement in Joker, although he simply states he will only talk to Batman where he is then locked back up in his cell but he is finally freed when, during Bane's revolution, we see him and his men break into Arkham Asylum and where they free Crane, they let go of Arkham's inmates, including Joker as Bane doesn't view him threatening(one of his biggest mistakes

) and during the whole siege, Joker slowly starts to find out what's been going on and decides to make a name for himself during this siege and has most of the Arkham inmates as his army so when the war infront of City Hall happens, it's a three army war consisting of Bane's men and the Blackgate inmates, Batman and the GCPD and Joker and the Arkham inmates.
Batman tries to stay focus on only Bane as the bomb is his main objective and we get past the whole Talia reveal and when she leaves, Joker enters to situation, stopping Bane from killing Batman and Bane then turns his attention to Joker where he tries to choke him out, leading to Catwoman still blasting Bane away using the Bat-pod, which also knocks Joker down, but doesn't kill him as the blast was directed to Bane. Batman tells Catwoman to go after Talia while we get another dual of wits between Batman and Joker and even when Batman wins clearly with his strength as he leaves City Hall, Joker grabs the same shotgun Bane was using and before he get get the kill, he is shot by...Foley.
Yes, I imagined this would help Foley's arc in that besides being inspired to help by viewing the bat logo on the bridge, he can actually help Batman. Instead of dying by the hands of the Tumbler, he is knocked out during the war by Joker who sneaks his way into the fight between Bane and Batman and Foley, coughing up blood, dazed and confused, does one last heroic act and shoots Joker down since Batman was never going to kill Joker with it being his one rule.
And since Blake won't be involved to give all of his time to Joker while keeping under the 165 mins. and to also use Bane and Talia, the film ends with Bruce actually sacrificing himself, Gordon being the one and not Blake to put his badge down and resign as Commissioner, Alfred still moving on, Fox and Wayne Enterprises picking up the pieces, and Catwoman throwing away her clean slate and only has a figurative clean slate and she now watches over Gotham City.
So...what do you guys think? Don't be too harsh now, I just thought of this today, haha.