I agree with him that Yoda is the better mentor for the moment because Obi-Wan tells Luke in Return of the Jedi that Yoda will always be with him. It makes sense that Yoda would be the one to appear to Luke when he’s tapped back into the Force. However I couldn’t disagree more about Luke’s relationship being more with Vader than Anakin.

Let’s rewatch this scene from Return of the Jedi.

Anakin should’ve appeared though to Ben Solo instead of the figment of his imagination. Why didn’t Anakin appear before? Dark Side users can’t see Force Ghost. That’s at least what I think George said once. So it makes sense he’d appear at his moment of redemption. You could have Anakin and Luke communicate after Rey leaves the island for a brief moment and talk about how they’ll both finish what they started all those years ago on Death Star II.