idea/theory: a few weeks after the Just Dancers freed, Night Swan is purified back into Leda (MOTDF outfit), but would refuse to redeem herself and expose her identity as a human on earth, and later, wreck the temple, and Leda disguises herself as Master Panda and tricks the Just Dancers (especially Rose) into doing her bidding, just like Odile in the original Swan Lake, who disguised herself as Oddette and tricked the prince to loving her. imprisoning the real Master Panda at the bottom of the sea until he was saved by The Traveler.
The Just Dancers were later saved by the The Traveler and the real Master Panda
I do like this concept, although personally, I'd tweak a few things; namely the just dancers seemingly being clueless about the manipulation
Both Wanderlust and Sara know Leda/Nightswan can shapeshift, and I would think they'd inform the others. Along with that, Mihaly and Master Panda seem to have a parent/child dynamic, so if Leda slipped up once around them, it'd give her away immediately.
I guess what I'm trying to say is, at the very least, I don't think it'd get past Mihaly at least. Although I do think they'd at least insist help from the actual master panda and (as much as I hate him) the traveler, assuming they know him and can contact him.