Okay, okay... WHAT IF? Agatha ISN'T the one "all along" and her rad an catchy theme song is just a manifestation of Wanda trying to pin blame on someone besides her own mental breakdown?
in the comics, Agatha has historically been Wanda's mentor. I wonder if they're setting her up to be a villain for phase 4, especially considering she's going to be a prominent figure in Doctor Strange and the Multiverse of Madness
which.. considering a brother was pulled from another dimension (whether it was her or Agatha, or both) leads credence to the fact that doc strange 2 will probably be dealing with the fallout of WandaVision in some capacity, right?
AND (omg shut up me) Agatha hasn't always been on the side of good, I believe her loyalty was first to Mephisto (who first appeared in comics AS A FLY and there WAS A FLY)