I guess the thing is about silver is. There's this quote from questions for Ada "l have pasts inside me that i did not bury properly." And silvers whole thing is the reflection of that, the opposite. He did bury them properly. Properly and completely. There's no lie by omission in his eyes because the person that he was is dead. He has no past.
Before the story even took place something happened to him that killed the person he was, leaving in place a blank slate. And that slate is the foundation upon he built John Silver.
Whatever happened. Is not painful to him, it has little meaning, it does not belong to him. because in his eyes it didn't happen to him. There is a clean cut severing who he once was, and who he has built in their place.
To acknowledge that his past is HIS. That he was not truly born on that ship that day when he stumbled on to flints path, that would require a complete undoing of self. He'd have to go back to the foundation of everything he understands himself to be. And why would he?
