MMA math doesn't work, everyone knows that. Your argument is solely based on something everyone knows doesn't work because in MMA, the styles of the fighters and there physical attributes and abilities matter significantly.
I have been watching MMA for 20 years, the first 3 years was casual watching, the last 17 have been regular, my opinion is based on my time watching and discussing fights and breaking down how I think fights will go based on similar style opponents and fighters strengths and weaknesses how I think they match up with various people, in different areas(kickboxing range, boxing range, in the clinch, on the ground, on top on bottom.).
I think Fedor has too many areas where he would have the advantage in his prime vs DC(standing, ground game on top and bottom, KO power, speed, reaction time, fight IQ, DC has wrestling but Fedor's TDD and Takedowns were very good too).