Besides, isn’t Anakin’s story finished with ROTJ ? I wouldn’t mind seeing “young Anakin ghost” in VIII, but only as a mean to “help” Ren to go back to the light.

(someone tried something about that with Qui Gon/Vader, an idea that would have happened if the movies had been shot from EpI to EpVI I guess: https://www.youtube.com/watch?v=axlAcj5Lx08)

However, VIII seems to go on the path of giving a new “hindsight” about the events of Ep I to Ep VII, so… who knows about a conflicted Anakin ghost ?