First off: One More Day was a deliberate Take That at the fans; Joe Quesada has admitted it. As such, it's a Gainax Ending, not a Gank.
Every last entry in the Western Animation section was a single episode of a larger series that had a confusing ending. And that's it. A Fandom Gank requires the Fandom to be up in arms about it. If any of those endings upset their respective fans, there's no indication here. I also have some reservations about the ending of a random episode really providing a Gank; it seems to me only that the Grand Finale of a show could really qualify, because it would permanently and finally alter the nature of the show, with no chance to change it back; a random episode is basically subject to the Reset Button.
Anything else left in place with a Context tag needs some kind of explanation justifying classification as a Gank. It must have had a negative fan reaction. If it didn't have one, it needs to be deleted. Remember -- this is an Audience Reaction trope, and as such the examples all need the reaction of the audience.