So, I was rewatching the deleted scenes for Endgame on Disney+, and it got me thinking, how does a deleted scene get chosen whether it's considered canon or not. The alternate version of Natasha's Sacrifice on Vormir isn't canon, but the Avengers kneeling after Tony snaps is considered cannon. I get that stuff like Banner's Suicide attempt (In the Incredible Hulk) is considered canon, due to it being referenced later, in the Avengers is canon because it's later referenced, but what about those that aren't referenced later in the MCU, how do they get chosen as cannon or not?