The drop in times corresponds with Geb getting things right and pushing the boundary lower. To me it is believable that Geb did it 'unassisted' because he had such a superb background/capabilities. Those that followed him now had a very difficult task. They had to work to get better than one of the very best distance runners of all time, and one who was using all of the easy elements left available -- very flat courses with a lot of pacing assistance and not too much of a race to worry about (usually one not four or five).
Keeping up and getting ahead of the Geb might have required pulling out every stop, including some that might not be legit with some of the runners.
Keeping up and getting ahead of the Geb might have required pulling out every stop, including some that might not be legit with some of the runners.
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