One thing the article fails to mention but that further supports the argument for training to a Gretzky level of performance is Gretzky's commitment to practice and his attitude towards it summed in these quotes:
"The only way a kid is going to practice is if it's total fun for him... and it was for me."
"I wasn't naturally gifted in terms of size and speed; everything I did in hockey I worked for, and that's the way I'll be as a coach."
Read the full article at: http://www.wired.com/science/discoveries/magazine/15-06/ff_mindgames