NoLongerActive2

Ohhhh boy, my overly analytical mindset has returned! To start things off, the way I interpret this question is: any character that could be a changeling in disguise had to have been captured (or something similar) at the end of the season 6 premier. If the changelings are indeed coming back, we should probably be looking back at the season 2 finale to get some clues. The first ponies that come to my mind are Lyra Heartstrings, Colgate/Minuette, and Twinkleshine. Remember that they served as fake Cadence's bridesmaids (and had been temporarily mind controlled as well). Coinciding with this fact, Colgate/Minuette and Twinkleshine also had their time in the limelight not too long ago in Amending Fences (with Lyra getting her name mentioned as well). I wouldn't be surprised if ol' Chrissy decided to try that again on them. My next guess would have to be Sunburst. Something tells me with his character being properly introduced at the BEGINNING of the season, it would only make sense to see him return at the END as well. Being the crystaller to the new alicorn princess would make him a prime target for Chrysalis, which would then set up opportunities to get closer to and/or blackmail the other princesses and Mane 6. Twilight and Shining's parents could also be ponies of interest for this theory. Similar to Sunburst, they could be used as modes of reconnaissance, and to manipulate Twilight and Shining (because who can say no to their parents??). As for the Pinkie clone, I can see that as a definite possibility as well. Probably not my favorite theory, but it DOES seem to be the one that makes the most sense. ...I probably put TOO much thought into this one...