>>56559962The others are also alpha and beta versions. Still, USUM has the merit of telling something other than SM's conclusion.
I mean, Lusamine's development around her family and Nihilego doesn't tell the same story as Necrozma's development, which has its own conclusion and motivations that also make it a character. Platinum or Emerald add a scene at the end, but it doesn't tell anything significantly different, because the conclusion and what's said and what happens is the same.