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I agree to a point. Acquiring or improving skill is constantly happening in any endeavor one decides to master over the years through deliberate practice. I think this happens consciously and unconsciously so long as the desire to meet the endgame is intact and the person is sensitive to recognize what works and what doesn't.
Any radical departure however from that which allowed for a person's mastery seems a mistake. New methods born from ideas or insight should always be on the table for an athlete to consider and apply, at the point that they make training more and not less efficient. That seems like common sense.
As an "expert" continues to develop and optimize his or her skill he or she may or may not become aware of subtitles in the process. At times I believe mastery goes beyond one's ability to talk about or even think about. Insight and skill happens, as almost by magic, but it takes thousands of hours of deliberate and purposeful repetition with the right balance of challenge and response always being evaluated and adjusted accordingly.
I might be repeating myself, but I think it worth my mention again, taking Dathan, a seasoned athlete that was truly flirting with the possibility of a world class marathon, that set an American record at 5 K was doing something right. Given that, why make a radical readjustment to the process based on some idea that someone thinks might work, no mater how attractive that idea.
I think that Alberto using his influence to persuade Dathan to take such a risk was doing Dathan a major disservice, assuming it was as per the context of the article, in my opinion.
Given his recent successes as a coach I really would like to believe and I should think and have thought it most plausible Alberto is a rational player, an interesting person and an admirable coach. That article in the New Yorker seemed to suggest otherwise, but for what ever reason, I realize people say things and do things quite differently. I would like to think he is sensitive to what works for Dathan, and that they have both been happy with the progress leading up to Sunday.