They have done research to see who was the 10 best World Champions. Using SF 6 and studying 25.800 games and 2 million positions. Who played most accurate and etc. The conclusion was 1. Carlsen 2. Kramnik 3. Fischer. 4. Kasparov 5. Anand.
Anyone can take statistics and "prove" anything. Fischer was a self-taught man. He didn't have grandmasters training him from a youth. It has also been "proven" that Fischer blundered less than Carlsen. Take a lot of the "statistics" with a grain of salt. Bobby Fischer was a once in a generation phenomenon just like Carlsen.
Yawn