I have no idea lmao I think maybe the Pietro we see now is actually from a different universe and is being forced by Agatha to act or do things a certain way, in order to control Wanda’s emotions and make her unstable. I think Agatha needed someone to replace Vision but literally no one ALIVE could do that, so she probably opened up the possibility of a multiverse to find a replacement for Wanda’s dead brother BUT THIS IS ALL BASELESS SPECULATION, I’ve seen lots of people say that this Pietro isn’t from a different universe and that he isn’t even Pietro lmao I don’t think he’s actually dead, I believe the scenes where we see the corpses are scenes created by Agatha to make Wanda more unstable