One point about No4. Obviously if you are faster you are required to absorb greater forces to decelerate and change direction (so changing direction is more difficult - just as negociating a corner going at 100mph is harder than doing it at 30 in a car) BUT as CF says if you are faster doesn’t mean you have to use all of that speed. Instead you can run at a lower percentage of your maximum speed, which is easier for you than the slower guy meaning you can repeat it more often, and now change direction just like everyone else. On those few “game winning” occasions when you need to make a break away run in a fairly straight line you will get there quicker than anyone else and score that touch down, goal, make that tackle etc…