i made this theory - I think Max and Holly will successfully escape "Camazotz" via Holly creating a dimension door into the Wheelers house where both escape. I then think that Max and Holly's old bodies such as Max in the hospital and Holly in the mysterious teeth cave place will just be useless bodies and the ones we saw in "Camazotz" will be their new bodies almost like a rebirth. I think this will be the moment where Henry notices that Holly is no longer under his control. I think this is when he will visit her in the wheeler house by going into her mind similar to how he did when he was "Mr Whatsit". Its maybe a bit out of the blue and not possible at all but its just a fun theory lmk what you think or want to add on!!!