Talk:My Little Pony Equestria Girls: Friendship Games/@comment-26837547-20150928093430/@comment-10390252-20150928105513

They didn't really 'finish off' the stinger in Rainbow Rocks. It just confirmed Sci-Twi's exitence and made it clear that her trajectory was towards becoming involved in the girls' activiites.

Similarly, I think that the stinger at the end of Friendship Games is to confirm that the two Twilights have met and that it doesn't blow up one or both universes when it happens. It means that they can cut out a needlessly lengthy explanation/exposition scene in the next installment when the Six explain to Sci-Twi why everyone at school thinks that they know her.