But he looked more like his Force Phantom self in the TLJ flashbacks than he does here. Unless he’s interacting or guiding Rey through visions similar to what she had involuntarily in TFA? The possible wrinkle here is everyone percieves Luke as they last saw him?
That’s what Mike Zeroh said apparently. I don’t buy anything he says but hey!
I think it’s more just a mock up. Even The Last Jedi photography had Phasma without her helmet on. We only saw her eye in the final film. I don’t think these things are meant to be taken literally but do feed into story context in subtle ways. If that makes sense?