This theory makes more and more sense every day because I just remembered that absolutely all the characters who started the season with secrets and problems resolved them early on. All of them eventually had to admit what they kept hidden. Will had to face his fears. Nancy and Jonathan had to admit the things they didn't like about each other. Dustin and Steve had be honest with eachother. Eleven and Hopper had to learn to be honest and stop lying. Even Robin and Vickie had a moment of "confessing the truth". Even Vecna faced the memory that scared him the most. But the only character that we knew nothing about when it comes to their emotions, who never admitted anything, who continued to hide instead of facing his fears, is Mike.