Endgame is not gonna end in the Best Picture category. Get that on your mind. I might get surprised if they do (just like with BP), but it doesn't really deserve it, imo. Joker, meanwhile, is its own thing, it has a hell of a good story, amazing acting and an alarming message. What's the message that Avengers: Endgame wants to pass? None. Its just an emotional finale for all the movies that came before in the franchise. It won't, at all, relate to the people who never saw the movies before. Lord of the Rings only has three movies (and tbh, I don't think it deserved to win the Best Picture). Endgame is a pretty great movie, but for the Best Picture, never.