A Power Lifter who may even be smaller, can usually move much more weight, especially pound for pound. There is a correlation between a muscle's cross-sectional area and the amount of force it can produce. Anaerobic glycolosis or the lactic acid energy system burns carbohydrate stored in the muscle. This allows them to race faster by conditioning their bodies to better carry away lactic acid as well as training their minds to accept the higher breathing and burning sensation during their event. But, I digress.
Muscles grow big to accommodate sustained use.
They need all the muscle they can get and as little fat as possible for their 10 second to 2 minute events. And, all of these athletes will do both strength and power training for the simple reason that after their power phase they can return to their hypertrophy program and start out at 15 reps with a weight that used to be impossible for ten. As they work back through their strength and power cycles they find that they're lifting more and more, and ultimately playing their sport better and better. They improve year after year. With few exceptions we all look like what we do, physically.