Bilbo the 100 metres is just a straight sprint, the 200 metres requires endurance aswell. There is more likelyhood of the greatest 200m runner also being a 400m runner, i.e Michael Johnson, very rarely has the greatest 200m runner being a 100m runner. Only Carl Lewis, and Usain Bolt througn history have been the best at both. Linford Christie, Donovan Bailey, Maurice Green etc etc (Olympic champions at 100m) were never great 200m runners.
Hard to say whose achievement is bigger between Phelps and Bolt, but recovery time and many other factors allow a swimmer to do mumerous events. I bet you anything Bolt goes down a sthe story of this olympics more than Phelps does
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