The point is, Conor had every physical advantage in that fight. You can't just flip the fight to MMA, where Conor still has every physical advantage, PLUS it's his sport, and say it's a mirror of the fight dynamic at play in the boxing match.
Conor vs Ward in an MMA fight is a lot closer to the same dynamic. Conor still wins that, but Ward at least brings something to the table.
Better yet, wait 12 years, and put that version of Conor against the top, prime, boxer at a higher weight class that is fighting at that time.