Are there humans which the brain sends signals to the limbs faster than the average?
Assuming that the time it takes for a signal to travel from the brain to the limbs follows a normal distribution (which is reasonable), then certainly there are people who fall at the upper and lower ends of the distribution. In fact, it's relatively improbable that someone would fall right at the mean.

Consider the normal distribution below. If the mean for all humans is at the center of the distribution, then almost all fall above or below that mean. Whether Messi falls in the lower tail is a separate question.