SPOILERS FOR WANDAVISION AHEAD
The appearance of Evan Peters as Pietro Maximoff aka Quicksilver in WandaVision confused Wanda and fans which seemingly was the point according to Marvel’s Kevin Feige. He mentioned today at TCA (via GameSpot) that placing Peters in the series was part of “certain people” messing with Wanda.
FEIGE: “That’s one of the fun things about developing these things are blue skying it in a room. It’s my favorite part of the process. It’s always the very very beginning, when we’re figuring out what something could be and at the very very end, when we’re finally we’re finding it and then putting it out into the world. So there were all all sorts of discussions, but I believe it, we ended up going with what you saw relatively relatively early on in the development process. And just another way that certain people were messing around with Wanda.”
From this statement from Feige about adding the actor, we can now assume that the choice to add Peters wasn’t a way for Marvel Studios to reinsert his version of Quicksilver or bring the Singerverse to the Marvel Cinematic Universe. A theory that has been pushed by fans since the actor’s addition to the series and his subsequent reveal as Pietro.
Showrunner Jac Schaeffer previously mentioned that they really had to convince Kevin about adding Evan on the show.
We’ll likely get more answers with the final two episodes.
SOURCE: GAMESPOT & FANDOM