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This is a two-point commentary: 1. I’m sad to see Usain Bolt retire. 2. Bolt’s retirement makes me marvel even more at Tom Brady. The connection? Bolt closed his sprinting career at the IAAF World Championships last week in London. He’s 30 years old. He’s still great. Why is he retiring? He’s tired of grinding to the degree that is required to be the best in the world. …