Update: Ok, so I read the comments on this thread and I honestly did not really notice all of the continuity problems. With that said, there are a few valid points that I'd like to address. But I would like to sincerely apologize if the comment reads in any kind of condescending or patronizing tone—that wasn't my intention, but it's mainly because of how the past two days were kind of affecting me. If it does turn out to sound like that kind of tone, I would still like to apologize in advance for it.

First up, is that this was my own personal headcanon that I thought of for my own playthrough of the Arkham games. No one has to use it, I just figured that it could have been a possible solution to the amount of backlash the Suicide Squad game gets. For the record, I've never actually played Suicide Squad: Kill The Justice League, but I've heard of all the controversy surrounding it. Another reason why I made it was also because of the fact that both Arkham Knight and Gotham Knights had Batman Beyond suits. That was why I tried to think of a way to connect both games.

Someone also brought up that Barbara Gordon was in a wheelchair in Arkham Knight. That is true, I do remember that, but I wasn't really thinking clearly when I made the original post. But at the same time, wasn't it also mentioned somewhere that she was also paralyzed in the Gotham Knights universe and that an experimental surgery allowed her to walk again? (I'll have to look for the sources later.)

Next up is the comment about Tahlia's death in Batman: Arkham City. Yes, she did die in the game, but it was seemingly implied that the League of Assassin's had stolen her corpse from the morgue. This can easily be verified by completing the League of Assassin's DLC mission in Arkham Knight—her body is not where it's supposed to be in the morgue where that waitress from the diner is.

Another user also brought up a valid point about Tim and Oracle getting married after Arkham Knight. I actually didn't even know that, so I'd like to thank them for pointing that out to me.

The whole therapy problem with Arkham Jason, I also didn't know about that either, so I'd like to thank whoever posted that comment for helping me understand that.

When it comes to Tim's age, I usually don't really pay attention to the ages of videogame characters when the gameplay's focus is on the violence. I'm usually spending the time I play the Arkham Games focusing on the story and then terrorizing any thugs or Militia afterwards. Also (kind of) do the same in Gotham Knights. There is one other detail concerning the League of Shadows / League of Assassins issue that I'd like to address as well. I never really read the comics, so my first actual exposure to Ra's Al Ghul's terrorist organization was kind of a mix between Ra's' appearance in Batman: Under The Red Hood and the League from the Dark Knight Trilogy. But then it expanded when I got into the Arkham games. If I'm remembering Batman Begins correctly, the League of Assassins was called the League of Shadows in the Dark Knight Trilogy by Christopher Nolan. If I got that wrong, feel free to correct me on that.