Interesting experiment. But the 10,000 hours rule is a myth [1]. The variance in deliberate practice needed is huge: some top performers need 3,000 hours while others need 24,000 hours. Some never get to the top no matter how much they practice. Success is probably due to many different factors. Just focusing on the deliberate practice is neither necessary nor sufficient.

[1] http://www.sportsscientists.com/2011/08/talent-training-and-...