Board Thread:Naruto Discussions/@comment-4700229-20141027210331/@comment-1018594-20141105231114

@Elve, I don't think there was any other plot that could have made sense for a series-ending movie, after so much of the Final Arc revolved around them.

BUT, what DOESN'T make sense is that the Otsutsuki are actually moon people and that pretty much means the Sage, Senju/Uzumaki and Uchiha could only be so powerful because they're distantly alien.