it’s a significantly smaller leap of logic to accept the Shaw ghost as Anakin Skywalker
I don’t see how it makes more sense for him to appear in a form he never had than one he did.
I don’t see how it makes sense for him to appear in a form where he was heading straight to the dark side. Anakin stopped being a pure Jedi when he slaughtered the Tusken Raiders in Episode 2. His appearance in Jedi is from Episode 3, where the first thing he does is decapitating a helpless prisoner. And that is supposed to be his true, uncorrupted self?