It is the point of Double's comments and it is taking the point and expanding upon it, finding further conclusions. It was also exemplified in the article with the example of the varsity and j.v. football teams. The difference in those two teams' success is neither by accident nor attributable solely and fully to the highlighted individual (Pete's son) and his commitments and habits. That goes to leadership of those teams and leadership in the case of the individual (such as runners reading and posting here) often has to come from within — and instead of a coaching and training staff as a support system one will have friends and family. Knowing which of those voices to heed (or ignore) and when is all part of it. Having an influence (or voice) in one's life that tends to pull away from the habits of excellence rather than towards them can have counterproductive results.