This is laughable. You’ve shown data that is within hundredths of each other. Show splits of someone who ran slower than 4.0. Do you think for one minute these guys are throtteling back? LOL…Leroy Burrell didn’t win obviously, not because his acceleration or 30m time was inadequate but because his top end speed & speed endurance was not as good as Carls. The data points this out! Look at the splits. Moreover, Leroy was much more muscular and powerful than Carl as stated by Tellez serveral times which would correlate to his 30m being faster.
Further more, the better sprinters maximize stride rate throughtout the start by leveraging their strenghth to produce horizontal forces. The by product of producing maximal horizontal forces is a “fast or faster 30m” It is proper mechanics that will allow you to produce the forces required to run faster. Bottomline as I stated, your 30m time is an indicator for the rest of the race. Again, look at the splits,
Never put the cart before the horse. As most have said, Strength ie squats etc and specific strength ie hills or sled pulls are required to improve your 30m time.