Either there is a huge gap in the speed between the two of them or you are simply biased and just projecting your opinion into the equation.
It is truly ridiculous that you would sit here and back up your claim that Davis is simply faster based on watching a few practices. Even if you went to the practices with nothing else on your mind but to try and measure the difference in the speed between these two you wouldn't be able to tell. Without some kind of systematic method for measuring the difference, you would never know and simply cannot say what you claim based on your observations. It's laughable.