He prolly thinks that hitting a kicker gives more time in the air than a boxjump/flyout since you have to drop down from the kicker's height to the ground. But the same amount of time in a flyout would result in less impact when landing cause more of this time is spent on going up (and on a boxjump you can go even bigger and land in a slope/tranny), his theory is only right when you're a noob and suck at airing stuff, no offence.