The problem is not that lower is more or less difficult than upper or sd. I think each freestyler develop his skills according his structure or biotype. See the biotype of Arthur and Skora, they are differents. Skora is similar a bull, he is strenght and force and always apply this in his freestyle and he is hardcore only in lowers. Arthur is similar a tiger with plasticity, flexibility, style and creativity and by his biotype he always will be a allrounder with style and creativity. "Never one bull will be a tiger and viceversa".
The problem is if only one fundament (Lower) or (Lower, upper, sd and ground) with creative and style qualify an freestyler.
Because Arthur was better than Skora in upper, sd, creativity and style and Skora only was better than Arthur in Lower, and as Oli say "mile ahead ...", and thus don't need more competitions because the servants or friends define who win and not the freestyle.