With Stranger Things Season 4 Volume 1 having released recently, a lot of answers and questions were given by the end. There's enough known that viewers can guess at what the second half of the season will bring. Though there are enough questions left unanswered that it might take until Season 5 to get all the answers.

The mystery of who and what Vecna is has been answered. We know his origins and motivations. But there are some things still left unanswered about him. It might not be nothing but I feel that Miss Kelly has more to do with Vecna than has been apparent so far.

THE THEORY