The craziest plot twist would be if lila has slowly been taking away miraculous superheroes in secret and slowly been disgusing herself as them... The craziest thing will be if a lot of superheroes we see,there might be hints present to them being actually taken away and being replaced by lila which is maybe why we will have to watch season 6 again to maybe see the differences and small hints they dropped initially that superheroes were somehow influenced or taken away or kidnapped.
Theres a weird thing here lila has been stalking marinette as we see in that one stinger scene what if she's going after other superheroes too and already gotten them and slowly having replaced them until till the last episode it'll be revealed that everyone is actually fake now and every superhero is actually lila and the reals were secretly abducted or taken away or captured by lila
This is SUCH A FAR FETCHED THEORY BUT THE WAY THEY HYPE UP THE MYSTERY OF SEASON 6 HAVING SECRETS HIDDEN I DUNNO.......
I actually expect this kind of crazy plot twist by the way they have been hyping things up