Being professional athletes as the majority of AFL players are, most of them would already be near their peak pace. Just because someone is taller doesn't mean they are slower, and just because someone is shorter doesn't mean they are faster; the fastest man in the world is 195cm, Adam Goodes is 194cm and Ollie Wines is 187cm. Ollie's game style isn't about chasing prime condition forwards down and getting them holding the ball - his style is based on using his muscle, weight and grunt to get the ball effectively out of a stoppage contest. Ollie probably used up all his breath from the last contest anyways. You can't make a fair criticism when comparing a brute inside mid with a running outside mid/forward pocket rover.
We've lost Amon, Polec and White through injury this year and they provide our main source of run - you don't win games by running faster that the opposition, you win games by kicking more goals than the opposition.