He is a hard worker. Maybe not the most talented in history, but he is talented enough. Imagine instead of thousands of hours of practicing baseline grinding he would be practicing serve & volley. He would be great. Rafa has less dimensions, but he is the best there is in his dimension. So, he would be a serve & volley machine. If you combine that with his great tactics, competitiveness and mental toghness, you have an amazing player. And he would be more natural at it. He would be growing up in serve & volley era from his teens. I don't see any reasons why Rafa wouldn't be great serve & volleyer. Hard work, intensity and mental toughness own talent. And he has plenty of talent. Saying he is not the most talented, doesn't mean he doesn't have a lot of talent. But he makes up for it with other stuff. And the talent gap between him and some other greats is not that huge.