I personally think "they" were more powerful a lot more a few years ago during the "we hate everything Disney" era, but have lost their mojo as it were over the last year or so. I see some waiting in the wings just hoping for Disney to make another misstep again, you see it here on this site occasionally.
Well, at least from my interpretation is that Wanda's kids in WandaVision were real in that they had their own souls and bodies and we saw Wanda couldn't control them. They were their own sentient life forms they just couldn't leave the hex and I assume that's why she couldn't just make them again in MOM. I'm guessing that like we see in the credits behind Joe Locke's name it says near death near Westview dated three years ago so I'm going with the theory that Billy's soul entered that kids body. But of course we'll just have to see, they could do something completely different.
Except "Billy Maximoff" faded away out of existence at the end of WandaVision. Its still likely he is Billy Kaplan, with Billy Maximoff's "soul" inside of him, similar to the comics. The car crash backstory should confirm this, as Wanda wasn't in the car, so the parents killed were likely the Kaplan's.
True, but at least based on his response (at least in the trailer) he doesn't dispute it. We'll see, I'm guessing he's both, as in he won't denied being called Maximoff but he's still Billy Kaplan, but Marvel also put out a poster that said Billy Maximoff.
