What if Kylo CAN talk to Vader's ghost?

He wanted confirmation of his feelings towards the darkside. Han made sure of his confirmation instead. I'm thinking the first vision happened while training with Luke when he was starting to unleash his powers and that's when Snoke took advantage of him
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I think its clear that Kylo knows Vader fell to the light side. He even speaks of feeling the pull to the light. He wants to gain something that he believes he can get from the darkside.

 

He can't talk to Darth Vader's ghost, because Darth Vader didn't die. Anakin Skywalker died and became a Light Side force ghost. "Darth Vader" was just a title, not the real name of a person. There is no Dark Side Vader ghost.

Kylo is either having mental health issues by talkling to burnt helmets, or "Someone" (Snoke!) is influencing Kylo with fake Vader messages.

 

Bison Dele would not agree and neither would Kenobi & Yoda.

"The boy you trained, gone he is. Consumed by Darth Vader."

"A young pupil of mine, Darth Vader..."

"You can't win, Darth."

As for Sith-spirits, Sith ghosts and Sith phantoms... "Sith can't become force ghosts!!" --says who? George? Some Legends' author? If Disney was bold enough to disregard Lucas' Sequel Treatments, what will stop them from saying: "Sith CAN become force ghosts"? Whether we like it or not: old OOU quotes mean nothing, old EU rules about what Sith Lords can or can not do, no longer apply. With George out of the picture and Legends doing the same for the EU, the laws of the force are open to Disney's interpretation. No one knows how the mouse house will treat them on the BIG screen until we see the next episode(s).

In TCW and in Rebels they've featured the dark side spirits of Dathomir with Maul, Savage, Mother Talzin, Dooku, Ventress, Ezra, Kanan & Sabine. Talzin was not a Sith and she appeared as a Spirit after giving part of herself to restore Maul's fractured mind and body. I expect them to do something with Sith spirits... because Anakin died on Mustafar AFTER he killed the younglings in the Temple. So, we'll see...

 

I think it's kinda weird and unfair.

Dark side Sith, u can't become a ghost because we say so.

Darth side Nightsister, go-ahead! Become a ghost! Heck, possessions on good people r allowed!