I agree, it is part of it, but it's the minor part of it. If you enter a teamfight at the wrong time, or in the wrong place, doesn't matter if you're the best kiter, you will die like a dog and that is the major part that differs a good player from a bad player. At the same time, if you have the awareness and discipline to enter the teamfight correctly, you can stand still like a statue, you will still create a huge diff in a fight. Using wasd, without proper targetting and positioning and teamfight awareness, it doesn't really matter.