Part of me would love to see this happen, seeing the G5 Mane Five/Mane Six (with Misty) finding a way to journey back into G4, likely shortly after the events of ‘the Ending of the End, Part 2’ and before ‘the Final Problem’. I think that the CMC would have a lot of fun talking to Sunny, and I think that Scootaloo in particular might get a bit confused as to why Sunny looks so much like her, hehe.