Disagree. You have to consider the endurance it took for phelps to do what he did, as WELL as speed. He swam in a retarded number of races and qualifiers in a short short period of time. No, he didn't sprint swim, but he beat the best swimmers in the world again and again and again, sometimes racing twice in an hour. What bolt did was amazing, what phelps did was amazing, and for entirely different reasons...both where incredibly impressive athletic feats that stand separate.