“If he had learnt to show me (or tell me) what he sees, he could now show me.” Certainly, – but what is it like to show me what he sees? It is pointing to something under particular circumstances. Or is it something else (don't be misled by the idea of indirectness).
     You compare it with such a statement as: “if he had learnt to open up he could now open up & show me what's inside || I could now see what's inside. I say yes, but remember what opening up in this case is like.