[jacquesm]

Some people have that talent, others do not. And then those who do have that talent and put in the hours studying theory can go very far without ever looking at a computer to help them with analysis.

Carlsen is that once-per-generation exception, someone who has a talent that somehow allows him to see a little further down the game tree than others. I grew up next to someone who was nearly that good, but there are so many people in that bracket that outside of NL he's not very well known. The distribution of skill at the high end of chess is highly non-linear.