I believe Batman Gotham Knight should be included in the DCAMU.
So for Gotham Knight I understand it's supposed to be canon to TDK trilogy, but that never worked for me. Too many atheistic differences and Kevin Conroy sounds nothing like Christian Bale. I think this fits far better with the DCAMU since we never really got much of Batman's backstory filled in. Now, I'm not saying this with no evidence to back up my claim. Here is what I think is the strongest evidence - James Gordon.
Here is Jim's design in Gotham Knight:
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Now here he is a few years later in Son Of Batman:
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Minus the grey temples and new glasses, it's the same model. As for timeline notes, here's what I got:
- This film takes places over the course of at least a month or more to give time for Bruce Wayne to upgrade his suit and vehicle.
- This film is set early in Batman's career. James Gordon is a Police Lieutenant by this time and Batman seems relatively new to the public.
- In the beginning scene of "Deadshot", Deadshot's watch reads "Fri 7.13" as the date, placing the ending of this film in July. Between 2000 and 2013, 07/13 fell on a Friday in 2001, 2007 and 2012. Since this is early in Batman's career, it's most likely July of 2001 or possibly 2007.
- The Scarecrow has faced Batman before this film.
- Killer Croc and Deadshot both face Batman for the first time in this film. Croc gets a "new" tail by the time of Son Of Batman. He doesn't have a tail in Gotham Knight.