We might indeed find something of intellect closer! It would indeed be interesting! It is not, however, something we have reason to expect would be particularly

We might indeed find something of intellect closer! It would indeed be interesting! It is not, however, something we have reason to expect would be particularly probable. I am unsure what variety of "opinion" you hope to extract from your hypothetical Neanderthal, and take the opportunity to note that, as social mammals with large and adaptable brains, the opinion systems of intelligent hominids are substantially shaped by their upbringing and how they relate to the society around them, particularly as regards the more complex systems of thought.