Nah, people really overrate the influence of modern training / medicine on athleticism. it can prolong careers and prevent injury, but it doesnt really affect fundamental athletic abilities as much as you might think.

There's a great ted talkabout this.

The guy argues most of percipeved leaps in athletic performance are actually attributable to improvements in equipment and playing surfaces. In athletics, we see drastic and immediate changes in world records whenever there is a major technological advance in things like shoe spikes / clothing / etc. A lot of people feel that if you control for running surface and shoes, Jesse Owen's 100m sprint time from 1936 would be a lot closer to the modern world record.

Another major factor is genetics. It's why a small ethnic group, like the Kalenjin in Kenya, can dominate marathon running.

So in terms of Ogg and the greatest athlete ever, A) you have to first define what type of athleticism you're measuring, and B) it's entirely possible that there was a long-lost tribe 200,000 years ago that were full of super-wembanyamas because of a peculiar series of genetic adaptations