Re: Rory Mcilroy
He's has a lot of skill and, at 19, he is cooler under pressure than most tour veterans. Expect him to be a major force in the game in years to come.
Because the separation doesn't matter if both are moving slowly. X-factor is there because of the kinetic chain. It is how the sequencing works in the golf swing. They even said Rory doesn't have the largest X-Factor on tour. He does have hips that move 30% faster then the average tour player. For a person who is 6 inches shorter than most of the longest hitters on tour. What he lacks in swing arc, he makes up for in rotational speed.
Look at it this way. Which one would you think causes the fastest clubhead speed
X-Factor of 45 degrees, and hip rotation of 700 degrees per second
X-Factor of 70 degrees, and hip rotation of 400 degrees per second