Until Arc 6 landed, I would have dismissed this theory right off the bad since Return by Death (up to that point) seemed to have given Subaru immunity to memory tampering magic.
@@Sideyehusky Do things at the tea party affect the real world aside from the fact that Subaru changes his actions based on what he experienced there? Maybe the answer will be "yes" depending of Echidna gets revived, but at the moment it is halfway between a dream of Subaru and halfway real. I mean I know it's real but at the same time it sort of isn't... it's hard to explain but there is a reason I didn't count that. I might be proven wrong later but as of now there was a reason to not be sure if it was real.