The 40 says so much. You have the different splits out of it. Smitty is a type of receiver that moves fluidly and accelerates to full speed so quickly. Compare that to a dude that looks like his head is going to explode and might get a 4.3-4.4....but no one runs like that with pads on and maintains control through routes. It's how they run the 40 just as much as it is the time. When Calvin Johnson came out and can run what he did and make it look effortless...that's special.