Fischer was no more born with natural tallent than any other GM Bobby went to chess classes and had a chess teacher that beat him all the time Bobby read books and studied and memorized and worked his freak'n little kid butt off because his parents paid for him to go to chess classes. He is good because he worked just like anyone reading this post could get better if they work harder and memorize and study like Bobby did, he BECAME a GM it wasn't born to him. He loved it which is why he TRIED to understand it. Same as every GM.
People are born with the great talent or not. If they don't, no matter what your chess coach tells you and how much you work, you will not become Fisher, Kasparov, Tal, Capablanca, Morphy, etc. Don't tell me that modern crap, that anybody can be super-GM. Take Magnus Carlsen - don't you think he has a great natural talent? In his 17 he plays endgames like Capablanca. So, he will be the world champion, not somebody just working his ass off. Of course, talent should be multiplied by work, but work without talent? By the way, Fisher worked much more than anybody else, chess was everything for him. I am not even his fan, never was, but I listened to super-GM Mark Taimanov many years ago and he knew Fisher (he lost to him 0:6) and that's what he said about him.
Even Fischer admitted that out of all the old grandmaster games he studied, he was most impressed by Capablanca. Also in an analysis of old games by all of the greatest players, it was determined that Capablanca's moves were the most perfect/correct. I say that Capablanca was the greatest chess genius ever, in a time before lots of study material was available.
In the Fischer vs Kasparov debate, I would have to say that it is a draw, they are both insanely good.